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| author | Andrey Andreev <narf@devilix.net> | 2018-01-13 12:57:11 +0100 |
|---|---|---|
| committer | Andrey Andreev <narf@devilix.net> | 2018-01-13 12:57:11 +0100 |
| commit | 02a0518e1c56ba3506f370362ac5ebdb8a138312 (patch) | |
| tree | 8b4684192b403dcae17d298eb4fc9e7ab001acad /user_guide/libraries/sessions.html | |
| parent | f0b9735d5857e6c07c8f5824b13cff4828db3cfe (diff) | |
[ci skip] 3.1.7 release
Diffstat (limited to 'user_guide/libraries/sessions.html')
| -rw-r--r-- | user_guide/libraries/sessions.html | 1922 |
1 files changed, 1922 insertions, 0 deletions
diff --git a/user_guide/libraries/sessions.html b/user_guide/libraries/sessions.html new file mode 100644 index 000000000..d3f4263d8 --- /dev/null +++ b/user_guide/libraries/sessions.html @@ -0,0 +1,1922 @@ + + +<!DOCTYPE html> +<!--[if IE 8]><html class="no-js lt-ie9" lang="en" > <![endif]--> +<!--[if gt IE 8]><!--> <html class="no-js" lang="en" > <!--<![endif]--> +<head> + <meta charset="utf-8"> + <meta name="viewport" content="width=device-width, initial-scale=1.0"> + + <title>Session Library — CodeIgniter 3.1.7 documentation</title> + + + + + <link rel="shortcut icon" href="../_static/ci-icon.ico"/> + + + + <link href='https://fonts.googleapis.com/css?family=Lato:400,700,400italic,700italic|Roboto+Slab:400,700|Inconsolata:400,700&subset=latin,cyrillic' rel='stylesheet' type='text/css'> + + + + + + + + + + <link rel="stylesheet" href="../_static/css/citheme.css" type="text/css" /> + + + + <link rel="index" title="Index" + href="../genindex.html"/> + <link rel="search" title="Search" 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href="../contributing/index.html">Contributing to CodeIgniter</a><ul> +<li class="toctree-l2"><a class="reference internal" href="../documentation/index.html">Writing CodeIgniter Documentation</a></li> +<li class="toctree-l2"><a class="reference internal" href="../DCO.html">Developer’s Certificate of Origin 1.1</a></li> +</ul> +</li> +</ul> +<ul> +<li class="toctree-l1"><a class="reference internal" href="../general/index.html">General Topics</a><ul> +<li class="toctree-l2"><a class="reference internal" href="../general/urls.html">CodeIgniter URLs</a></li> +<li class="toctree-l2"><a class="reference internal" href="../general/controllers.html">Controllers</a></li> +<li class="toctree-l2"><a class="reference internal" href="../general/reserved_names.html">Reserved Names</a></li> +<li class="toctree-l2"><a class="reference internal" href="../general/views.html">Views</a></li> +<li class="toctree-l2"><a class="reference internal" href="../general/models.html">Models</a></li> +<li class="toctree-l2"><a class="reference internal" href="../general/helpers.html">Helpers</a></li> +<li class="toctree-l2"><a class="reference internal" href="../general/libraries.html">Using CodeIgniter Libraries</a></li> +<li class="toctree-l2"><a class="reference internal" href="../general/creating_libraries.html">Creating Libraries</a></li> +<li class="toctree-l2"><a class="reference internal" href="../general/drivers.html">Using CodeIgniter Drivers</a></li> +<li class="toctree-l2"><a class="reference internal" href="../general/creating_drivers.html">Creating Drivers</a></li> +<li class="toctree-l2"><a class="reference internal" href="../general/core_classes.html">Creating Core System Classes</a></li> +<li class="toctree-l2"><a class="reference internal" href="../general/ancillary_classes.html">Creating Ancillary Classes</a></li> +<li class="toctree-l2"><a class="reference internal" href="../general/hooks.html">Hooks - Extending the Framework Core</a></li> +<li class="toctree-l2"><a class="reference internal" href="../general/autoloader.html">Auto-loading Resources</a></li> +<li class="toctree-l2"><a class="reference internal" href="../general/common_functions.html">Common Functions</a></li> +<li class="toctree-l2"><a class="reference internal" href="../general/compatibility_functions.html">Compatibility Functions</a></li> +<li class="toctree-l2"><a class="reference internal" href="../general/routing.html">URI Routing</a></li> +<li class="toctree-l2"><a class="reference internal" href="../general/errors.html">Error Handling</a></li> +<li class="toctree-l2"><a class="reference internal" href="../general/caching.html">Caching</a></li> +<li class="toctree-l2"><a class="reference internal" href="../general/profiling.html">Profiling Your Application</a></li> +<li class="toctree-l2"><a class="reference internal" href="../general/cli.html">Running via the CLI</a></li> +<li class="toctree-l2"><a class="reference internal" href="../general/managing_apps.html">Managing your Applications</a></li> +<li class="toctree-l2"><a class="reference internal" href="../general/environments.html">Handling Multiple Environments</a></li> +<li class="toctree-l2"><a class="reference internal" href="../general/alternative_php.html">Alternate PHP Syntax for View Files</a></li> +<li class="toctree-l2"><a class="reference internal" href="../general/security.html">Security</a></li> +<li class="toctree-l2"><a class="reference internal" href="../general/styleguide.html">PHP Style Guide</a></li> +</ul> +</li> +</ul> +<ul class="current"> +<li class="toctree-l1 current"><a class="reference internal" href="index.html">Libraries</a><ul class="current"> +<li class="toctree-l2"><a class="reference internal" href="benchmark.html">Benchmarking Class</a></li> +<li class="toctree-l2"><a class="reference internal" href="caching.html">Caching Driver</a></li> +<li class="toctree-l2"><a class="reference internal" href="calendar.html">Calendaring Class</a></li> +<li class="toctree-l2"><a 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class="toctree-l2"><a class="reference internal" href="trackback.html">Trackback Class</a></li> +<li class="toctree-l2"><a class="reference internal" href="typography.html">Typography Class</a></li> +<li class="toctree-l2"><a class="reference internal" href="unit_testing.html">Unit Testing Class</a></li> +<li class="toctree-l2"><a class="reference internal" href="uri.html">URI Class</a></li> +<li class="toctree-l2"><a class="reference internal" href="user_agent.html">User Agent Class</a></li> +<li class="toctree-l2"><a class="reference internal" href="xmlrpc.html">XML-RPC and XML-RPC Server Classes</a></li> +<li class="toctree-l2"><a class="reference internal" href="zip.html">Zip Encoding Class</a></li> +</ul> +</li> +</ul> +<ul> +<li class="toctree-l1"><a class="reference internal" href="../database/index.html">Database Reference</a><ul> +<li class="toctree-l2"><a class="reference internal" href="../database/examples.html">Quick Start: Usage Examples</a></li> +<li class="toctree-l2"><a class="reference internal" href="../database/configuration.html">Database Configuration</a></li> +<li class="toctree-l2"><a class="reference internal" href="../database/connecting.html">Connecting to a Database</a></li> +<li class="toctree-l2"><a class="reference internal" href="../database/queries.html">Running Queries</a></li> +<li class="toctree-l2"><a class="reference internal" href="../database/results.html">Generating Query Results</a></li> +<li class="toctree-l2"><a class="reference internal" href="../database/helpers.html">Query Helper Functions</a></li> +<li class="toctree-l2"><a class="reference internal" href="../database/query_builder.html">Query Builder Class</a></li> +<li class="toctree-l2"><a class="reference internal" href="../database/transactions.html">Transactions</a></li> +<li class="toctree-l2"><a class="reference internal" href="../database/metadata.html">Getting MetaData</a></li> +<li class="toctree-l2"><a class="reference internal" href="../database/call_function.html">Custom Function Calls</a></li> +<li class="toctree-l2"><a class="reference internal" href="../database/caching.html">Query Caching</a></li> +<li class="toctree-l2"><a class="reference internal" href="../database/forge.html">Database Manipulation with Database Forge</a></li> +<li class="toctree-l2"><a class="reference internal" href="../database/utilities.html">Database Utilities Class</a></li> +<li class="toctree-l2"><a class="reference internal" href="../database/db_driver_reference.html">Database Driver Reference</a></li> +</ul> +</li> +</ul> +<ul> +<li class="toctree-l1"><a class="reference internal" href="../helpers/index.html">Helpers</a><ul> +<li class="toctree-l2"><a class="reference internal" href="../helpers/array_helper.html">Array Helper</a></li> +<li class="toctree-l2"><a class="reference internal" href="../helpers/captcha_helper.html">CAPTCHA Helper</a></li> +<li class="toctree-l2"><a class="reference internal" href="../helpers/cookie_helper.html">Cookie Helper</a></li> +<li class="toctree-l2"><a class="reference internal" href="../helpers/date_helper.html">Date Helper</a></li> +<li class="toctree-l2"><a class="reference internal" href="../helpers/directory_helper.html">Directory Helper</a></li> +<li class="toctree-l2"><a class="reference internal" href="../helpers/download_helper.html">Download Helper</a></li> +<li class="toctree-l2"><a class="reference internal" href="../helpers/email_helper.html">Email Helper</a></li> +<li class="toctree-l2"><a class="reference internal" href="../helpers/file_helper.html">File Helper</a></li> +<li class="toctree-l2"><a class="reference internal" href="../helpers/form_helper.html">Form Helper</a></li> +<li class="toctree-l2"><a class="reference internal" href="../helpers/html_helper.html">HTML Helper</a></li> +<li class="toctree-l2"><a class="reference internal" href="../helpers/inflector_helper.html">Inflector Helper</a></li> +<li class="toctree-l2"><a class="reference internal" href="../helpers/language_helper.html">Language Helper</a></li> +<li class="toctree-l2"><a class="reference internal" href="../helpers/number_helper.html">Number Helper</a></li> +<li class="toctree-l2"><a class="reference internal" href="../helpers/path_helper.html">Path Helper</a></li> +<li class="toctree-l2"><a class="reference internal" href="../helpers/security_helper.html">Security Helper</a></li> +<li class="toctree-l2"><a class="reference internal" href="../helpers/smiley_helper.html">Smiley Helper</a></li> +<li class="toctree-l2"><a class="reference internal" href="../helpers/string_helper.html">String Helper</a></li> +<li class="toctree-l2"><a class="reference internal" href="../helpers/text_helper.html">Text Helper</a></li> +<li class="toctree-l2"><a class="reference internal" href="../helpers/typography_helper.html">Typography Helper</a></li> +<li class="toctree-l2"><a class="reference internal" href="../helpers/url_helper.html">URL Helper</a></li> +<li class="toctree-l2"><a class="reference internal" href="../helpers/xml_helper.html">XML Helper</a></li> +</ul> +</li> +</ul> + + + + </div> + + </nav> + + <section data-toggle="wy-nav-shift" class="wy-nav-content-wrap"> + + + <nav class="wy-nav-top" role="navigation" aria-label="top navigation"> + <i data-toggle="wy-nav-top" class="fa fa-bars"></i> + <a href="../index.html">CodeIgniter</a> + </nav> + + + + <div class="wy-nav-content"> + <div class="rst-content"> + <div role="navigation" aria-label="breadcrumbs navigation"> + <ul class="wy-breadcrumbs"> + <li><a href="../index.html">Docs</a> »</li> + + <li><a href="index.html">Libraries</a> »</li> + + <li>Session Library</li> + <li class="wy-breadcrumbs-aside"> + + </li> + <div style="float:right;margin-left:5px;" id="closeMe"> + <img title="Classic Layout" alt="classic layout" src="data:image/gif;base64,R0lGODlhFAAUAJEAAAAAADMzM////wAAACH5BAUUAAIALAAAAAAUABQAAAImlI+py+0PU5gRBRDM3DxbWoXis42X13USOLauUIqnlsaH/eY6UwAAOw==" /> + </div> + </ul> + <hr/> +</div> + <div role="main" class="document"> + + <div class="section" id="session-library"> +<h1>Session Library<a class="headerlink" href="#session-library" title="Permalink to this headline">¶</a></h1> +<p>The Session class permits you maintain a user’s “state” and track their +activity while they browse your site.</p> +<p>CodeIgniter comes with a few session storage drivers:</p> +<blockquote> +<div><ul class="simple"> +<li>files (default; file-system based)</li> +<li>database</li> +<li>redis</li> +<li>memcached</li> +</ul> +</div></blockquote> +<p>In addition, you may create your own, custom session drivers based on other +kinds of storage, while still taking advantage of the features of the +Session class.</p> +<div class="contents local topic" id="contents"> +<ul class="simple"> +<li><a class="reference internal" href="#using-the-session-class" id="id3">Using the Session Class</a><ul> +<li><a class="reference internal" href="#initializing-a-session" id="id4">Initializing a Session</a></li> +<li><a class="reference internal" href="#how-do-sessions-work" id="id5">How do Sessions work?</a><ul> +<li><a class="reference internal" href="#a-note-about-concurrency" id="id6">A note about concurrency</a></li> +</ul> +</li> +<li><a class="reference internal" href="#what-is-session-data" id="id7">What is Session Data?</a></li> +<li><a class="reference internal" href="#retrieving-session-data" id="id8">Retrieving Session Data</a></li> +<li><a class="reference internal" href="#adding-session-data" id="id9">Adding Session Data</a></li> +<li><a class="reference internal" href="#removing-session-data" id="id10">Removing Session Data</a></li> +<li><a class="reference internal" href="#flashdata" id="id11">Flashdata</a></li> +<li><a class="reference internal" href="#tempdata" id="id12">Tempdata</a></li> +<li><a class="reference internal" href="#destroying-a-session" id="id13">Destroying a Session</a></li> +<li><a class="reference internal" href="#accessing-session-metadata" id="id14">Accessing session metadata</a></li> +<li><a class="reference internal" href="#session-preferences" id="id15">Session Preferences</a></li> +<li><a class="reference internal" href="#session-drivers" id="id16">Session Drivers</a><ul> +<li><a class="reference internal" href="#files-driver" id="id17">Files Driver</a><ul> +<li><a class="reference internal" href="#bonus-tip" id="id18">Bonus Tip</a></li> +</ul> +</li> +<li><a class="reference internal" href="#database-driver" id="id19">Database Driver</a></li> +<li><a class="reference internal" href="#redis-driver" id="id20">Redis Driver</a></li> +<li><a class="reference internal" href="#memcached-driver" id="id21">Memcached Driver</a><ul> +<li><a class="reference internal" href="#id1" id="id22">Bonus Tip</a></li> +</ul> +</li> +<li><a class="reference internal" href="#custom-drivers" id="id23">Custom Drivers</a></li> +</ul> +</li> +</ul> +</li> +<li><a class="reference internal" href="#class-reference" id="id24">Class Reference</a></li> +</ul> +</div> +<div class="custom-index container"></div><div class="section" id="using-the-session-class"> +<h2><a class="toc-backref" href="#id3">Using the Session Class</a><a class="headerlink" href="#using-the-session-class" title="Permalink to this headline">¶</a></h2> +<div class="section" id="initializing-a-session"> +<h3><a class="toc-backref" href="#id4">Initializing a Session</a><a class="headerlink" href="#initializing-a-session" title="Permalink to this headline">¶</a></h3> +<p>Sessions will typically run globally with each page load, so the Session +class should either be initialized in your <a class="reference internal" href="../general/controllers.html"><span class="doc">controller</span></a> constructors, or it can be <a class="reference internal" href="../general/autoloader.html"><span class="doc">auto-loaded</span></a> by the system. +For the most part the session class will run unattended in the background, +so simply initializing the class will cause it to read, create, and update +sessions when necessary.</p> +<p>To initialize the Session class manually in your controller constructor, +use the <code class="docutils literal"><span class="pre">$this->load->library()</span></code> method:</p> +<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-></span><span class="na">load</span><span class="o">-></span><span class="na">library</span><span class="p">(</span><span class="s1">'session'</span><span class="p">);</span> +</pre></div> +</div> +<p>Once loaded, the Sessions library object will be available using:</p> +<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-></span><span class="na">session</span> +</pre></div> +</div> +<div class="admonition important"> +<p class="first admonition-title">Important</p> +<p class="last">Because the <a class="reference internal" href="loader.html"><span class="doc">Loader Class</span></a> is instantiated +by CodeIgniter’s base controller, make sure to call +<code class="docutils literal"><span class="pre">parent::__construct()</span></code> before trying to load a library from +inside a controller constructor.</p> +</div> +</div> +<div class="section" id="how-do-sessions-work"> +<h3><a class="toc-backref" href="#id5">How do Sessions work?</a><a class="headerlink" href="#how-do-sessions-work" title="Permalink to this headline">¶</a></h3> +<p>When a page is loaded, the session class will check to see if valid +session cookie is sent by the user’s browser. If a sessions cookie does +<strong>not</strong> exist (or if it doesn’t match one stored on the server or has +expired) a new session will be created and saved.</p> +<p>If a valid session does exist, its information will be updated. With each +update, the session ID may be regenerated if configured to do so.</p> +<p>It’s important for you to understand that once initialized, the Session +class runs automatically. There is nothing you need to do to cause the +above behavior to happen. You can, as you’ll see below, work with session +data, but the process of reading, writing, and updating a session is +automatic.</p> +<div class="admonition note"> +<p class="first admonition-title">Note</p> +<p class="last">Under CLI, the Session library will automatically halt itself, +as this is a concept based entirely on the HTTP protocol.</p> +</div> +<div class="section" id="a-note-about-concurrency"> +<h4><a class="toc-backref" href="#id6">A note about concurrency</a><a class="headerlink" href="#a-note-about-concurrency" title="Permalink to this headline">¶</a></h4> +<p>Unless you’re developing a website with heavy AJAX usage, you can skip this +section. If you are, however, and if you’re experiencing performance +issues, then this note is exactly what you’re looking for.</p> +<p>Sessions in previous versions of CodeIgniter didn’t implement locking, +which meant that two HTTP requests using the same session could run exactly +at the same time. To use a more appropriate technical term - requests were +non-blocking.</p> +<p>However, non-blocking requests in the context of sessions also means +unsafe, because modifications to session data (or session ID regeneration) +in one request can interfere with the execution of a second, concurrent +request. This detail was at the root of many issues and the main reason why +CodeIgniter 3.0 has a completely re-written Session library.</p> +<p>Why are we telling you this? Because it is likely that after trying to +find the reason for your performance issues, you may conclude that locking +is the issue and therefore look into how to remove the locks …</p> +<p>DO NOT DO THAT! Removing locks would be <strong>wrong</strong> and it will cause you +more problems!</p> +<p>Locking is not the issue, it is a solution. Your issue is that you still +have the session open, while you’ve already processed it and therefore no +longer need it. So, what you need is to close the session for the +current request after you no longer need it.</p> +<p>Long story short - call <code class="docutils literal"><span class="pre">session_write_close()</span></code> once you no longer need +anything to do with session variables.</p> +</div> +</div> +<div class="section" id="what-is-session-data"> +<h3><a class="toc-backref" href="#id7">What is Session Data?</a><a class="headerlink" href="#what-is-session-data" title="Permalink to this headline">¶</a></h3> +<p>Session data is simply an array associated with a particular session ID +(cookie).</p> +<p>If you’ve used sessions in PHP before, you should be familiar with PHP’s +<a class="reference external" href="http://php.net/manual/en/reserved.variables.session.php">$_SESSION superglobal</a> +(if not, please read the content on that link).</p> +<p>CodeIgniter gives access to its session data through the same means, as it +uses the session handlers’ mechanism provided by PHP. Using session data is +as simple as manipulating (read, set and unset values) the <code class="docutils literal"><span class="pre">$_SESSION</span></code> +array.</p> +<p>In addition, CodeIgniter also provides 2 special types of session data +that are further explained below: flashdata and tempdata.</p> +<div class="admonition note"> +<p class="first admonition-title">Note</p> +<p class="last">In previous versions, regular session data in CodeIgniter was +referred to as ‘userdata’. Have this in mind if that term is used +elsewhere in the manual. Most of it is written to explain how +the custom ‘userdata’ methods work.</p> +</div> +</div> +<div class="section" id="retrieving-session-data"> +<h3><a class="toc-backref" href="#id8">Retrieving Session Data</a><a class="headerlink" href="#retrieving-session-data" title="Permalink to this headline">¶</a></h3> +<p>Any piece of information from the session array is available through the +<code class="docutils literal"><span class="pre">$_SESSION</span></code> superglobal:</p> +<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$_SESSION</span><span class="p">[</span><span class="s1">'item'</span><span class="p">]</span> +</pre></div> +</div> +<p>Or through the magic getter:</p> +<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-></span><span class="na">session</span><span class="o">-></span><span class="na">item</span> +</pre></div> +</div> +<p>And for backwards compatibility, through the <code class="docutils literal"><span class="pre">userdata()</span></code> method:</p> +<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-></span><span class="na">session</span><span class="o">-></span><span class="na">userdata</span><span class="p">(</span><span class="s1">'item'</span><span class="p">);</span> +</pre></div> +</div> +<p>Where item is the array key corresponding to the item you wish to fetch. +For example, to assign a previously stored ‘name’ item to the <code class="docutils literal"><span class="pre">$name</span></code> +variable, you will do this:</p> +<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$name</span> <span class="o">=</span> <span class="nv">$_SESSION</span><span class="p">[</span><span class="s1">'name'</span><span class="p">];</span> + +<span class="c1">// or:</span> + +<span class="nv">$name</span> <span class="o">=</span> <span class="nv">$this</span><span class="o">-></span><span class="na">session</span><span class="o">-></span><span class="na">name</span> + +<span class="c1">// or:</span> + +<span class="nv">$name</span> <span class="o">=</span> <span class="nv">$this</span><span class="o">-></span><span class="na">session</span><span class="o">-></span><span class="na">userdata</span><span class="p">(</span><span class="s1">'name'</span><span class="p">);</span> +</pre></div> +</div> +<div class="admonition note"> +<p class="first admonition-title">Note</p> +<p class="last">The <code class="docutils literal"><span class="pre">userdata()</span></code> method returns NULL if the item you are trying +to access does not exist.</p> +</div> +<p>If you want to retrieve all of the existing userdata, you can simply +omit the item key (magic getter only works for properties):</p> +<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$_SESSION</span> + +<span class="c1">// or:</span> + +<span class="nv">$this</span><span class="o">-></span><span class="na">session</span><span class="o">-></span><span class="na">userdata</span><span class="p">();</span> +</pre></div> +</div> +</div> +<div class="section" id="adding-session-data"> +<h3><a class="toc-backref" href="#id9">Adding Session Data</a><a class="headerlink" href="#adding-session-data" title="Permalink to this headline">¶</a></h3> +<p>Let’s say a particular user logs into your site. Once authenticated, you +could add their username and e-mail address to the session, making that +data globally available to you without having to run a database query when +you need it.</p> +<p>You can simply assign data to the <code class="docutils literal"><span class="pre">$_SESSION</span></code> array, as with any other +variable. Or as a property of <code class="docutils literal"><span class="pre">$this->session</span></code>.</p> +<p>Alternatively, the old method of assigning it as “userdata” is also +available. That however passing an array containing your new data to the +<code class="docutils literal"><span class="pre">set_userdata()</span></code> method:</p> +<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-></span><span class="na">session</span><span class="o">-></span><span class="na">set_userdata</span><span class="p">(</span><span class="nv">$array</span><span class="p">);</span> +</pre></div> +</div> +<p>Where <code class="docutils literal"><span class="pre">$array</span></code> is an associative array containing your new data. Here’s +an example:</p> +<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$newdata</span> <span class="o">=</span> <span class="k">array</span><span class="p">(</span> + <span class="s1">'username'</span> <span class="o">=></span> <span class="s1">'johndoe'</span><span class="p">,</span> + <span class="s1">'email'</span> <span class="o">=></span> <span class="s1">'johndoe@some-site.com'</span><span class="p">,</span> + <span class="s1">'logged_in'</span> <span class="o">=></span> <span class="k">TRUE</span> +<span class="p">);</span> + +<span class="nv">$this</span><span class="o">-></span><span class="na">session</span><span class="o">-></span><span class="na">set_userdata</span><span class="p">(</span><span class="nv">$newdata</span><span class="p">);</span> +</pre></div> +</div> +<p>If you want to add userdata one value at a time, <code class="docutils literal"><span class="pre">set_userdata()</span></code> also +supports this syntax:</p> +<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-></span><span class="na">session</span><span class="o">-></span><span class="na">set_userdata</span><span class="p">(</span><span class="s1">'some_name'</span><span class="p">,</span> <span class="s1">'some_value'</span><span class="p">);</span> +</pre></div> +</div> +<p>If you want to verify that a session value exists, simply check with +<code class="docutils literal"><span class="pre">isset()</span></code>:</p> +<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="c1">// returns FALSE if the 'some_name' item doesn't exist or is NULL,</span> +<span class="c1">// TRUE otherwise:</span> +<span class="nb">isset</span><span class="p">(</span><span class="nv">$_SESSION</span><span class="p">[</span><span class="s1">'some_name'</span><span class="p">])</span> +</pre></div> +</div> +<p>Or you can call <code class="docutils literal"><span class="pre">has_userdata()</span></code>:</p> +<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-></span><span class="na">session</span><span class="o">-></span><span class="na">has_userdata</span><span class="p">(</span><span class="s1">'some_name'</span><span class="p">);</span> +</pre></div> +</div> +</div> +<div class="section" id="removing-session-data"> +<h3><a class="toc-backref" href="#id10">Removing Session Data</a><a class="headerlink" href="#removing-session-data" title="Permalink to this headline">¶</a></h3> +<p>Just as with any other variable, unsetting a value in <code class="docutils literal"><span class="pre">$_SESSION</span></code> can be +done through <code class="docutils literal"><span class="pre">unset()</span></code>:</p> +<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nb">unset</span><span class="p">(</span><span class="nv">$_SESSION</span><span class="p">[</span><span class="s1">'some_name'</span><span class="p">]);</span> + +<span class="c1">// or multiple values:</span> + +<span class="nb">unset</span><span class="p">(</span> + <span class="nv">$_SESSION</span><span class="p">[</span><span class="s1">'some_name'</span><span class="p">],</span> + <span class="nv">$_SESSION</span><span class="p">[</span><span class="s1">'another_name'</span><span class="p">]</span> +<span class="p">);</span> +</pre></div> +</div> +<p>Also, just as <code class="docutils literal"><span class="pre">set_userdata()</span></code> can be used to add information to a +session, <code class="docutils literal"><span class="pre">unset_userdata()</span></code> can be used to remove it, by passing the +session key. For example, if you wanted to remove ‘some_name’ from your +session data array:</p> +<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-></span><span class="na">session</span><span class="o">-></span><span class="na">unset_userdata</span><span class="p">(</span><span class="s1">'some_name'</span><span class="p">);</span> +</pre></div> +</div> +<p>This method also accepts an array of item keys to unset:</p> +<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$array_items</span> <span class="o">=</span> <span class="k">array</span><span class="p">(</span><span class="s1">'username'</span><span class="p">,</span> <span class="s1">'email'</span><span class="p">);</span> + +<span class="nv">$this</span><span class="o">-></span><span class="na">session</span><span class="o">-></span><span class="na">unset_userdata</span><span class="p">(</span><span class="nv">$array_items</span><span class="p">);</span> +</pre></div> +</div> +<div class="admonition note"> +<p class="first admonition-title">Note</p> +<p class="last">In previous versions, the <code class="docutils literal"><span class="pre">unset_userdata()</span></code> method used +to accept an associative array of <code class="docutils literal"><span class="pre">key</span> <span class="pre">=></span> <span class="pre">'dummy</span> <span class="pre">value'</span></code> +pairs. This is no longer supported.</p> +</div> +</div> +<div class="section" id="flashdata"> +<h3><a class="toc-backref" href="#id11">Flashdata</a><a class="headerlink" href="#flashdata" title="Permalink to this headline">¶</a></h3> +<p>CodeIgniter supports “flashdata”, or session data that will only be +available for the next request, and is then automatically cleared.</p> +<p>This can be very useful, especially for one-time informational, error or +status messages (for example: “Record 2 deleted”).</p> +<p>It should be noted that flashdata variables are regular session vars, +only marked in a specific way under the ‘__ci_vars’ key (please don’t touch +that one, you’ve been warned).</p> +<p>To mark an existing item as “flashdata”:</p> +<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-></span><span class="na">session</span><span class="o">-></span><span class="na">mark_as_flash</span><span class="p">(</span><span class="s1">'item'</span><span class="p">);</span> +</pre></div> +</div> +<p>If you want to mark multiple items as flashdata, simply pass the keys as an +array:</p> +<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-></span><span class="na">session</span><span class="o">-></span><span class="na">mark_as_flash</span><span class="p">(</span><span class="k">array</span><span class="p">(</span><span class="s1">'item'</span><span class="p">,</span> <span class="s1">'item2'</span><span class="p">));</span> +</pre></div> +</div> +<p>To add flashdata:</p> +<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$_SESSION</span><span class="p">[</span><span class="s1">'item'</span><span class="p">]</span> <span class="o">=</span> <span class="s1">'value'</span><span class="p">;</span> +<span class="nv">$this</span><span class="o">-></span><span class="na">session</span><span class="o">-></span><span class="na">mark_as_flash</span><span class="p">(</span><span class="s1">'item'</span><span class="p">);</span> +</pre></div> +</div> +<p>Or alternatively, using the <code class="docutils literal"><span class="pre">set_flashdata()</span></code> method:</p> +<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-></span><span class="na">session</span><span class="o">-></span><span class="na">set_flashdata</span><span class="p">(</span><span class="s1">'item'</span><span class="p">,</span> <span class="s1">'value'</span><span class="p">);</span> +</pre></div> +</div> +<p>You can also pass an array to <code class="docutils literal"><span class="pre">set_flashdata()</span></code>, in the same manner as +<code class="docutils literal"><span class="pre">set_userdata()</span></code>.</p> +<p>Reading flashdata variables is the same as reading regular session data +through <code class="docutils literal"><span class="pre">$_SESSION</span></code>:</p> +<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$_SESSION</span><span class="p">[</span><span class="s1">'item'</span><span class="p">]</span> +</pre></div> +</div> +<div class="admonition important"> +<p class="first admonition-title">Important</p> +<p class="last">The <code class="docutils literal"><span class="pre">userdata()</span></code> method will NOT return flashdata items.</p> +</div> +<p>However, if you want to be sure that you’re reading “flashdata” (and not +any other kind), you can also use the <code class="docutils literal"><span class="pre">flashdata()</span></code> method:</p> +<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-></span><span class="na">session</span><span class="o">-></span><span class="na">flashdata</span><span class="p">(</span><span class="s1">'item'</span><span class="p">);</span> +</pre></div> +</div> +<p>Or to get an array with all flashdata, simply omit the key parameter:</p> +<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-></span><span class="na">session</span><span class="o">-></span><span class="na">flashdata</span><span class="p">();</span> +</pre></div> +</div> +<div class="admonition note"> +<p class="first admonition-title">Note</p> +<p class="last">The <code class="docutils literal"><span class="pre">flashdata()</span></code> method returns NULL if the item cannot be +found.</p> +</div> +<p>If you find that you need to preserve a flashdata variable through an +additional request, you can do so using the <code class="docutils literal"><span class="pre">keep_flashdata()</span></code> method. +You can either pass a single item or an array of flashdata items to keep.</p> +<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-></span><span class="na">session</span><span class="o">-></span><span class="na">keep_flashdata</span><span class="p">(</span><span class="s1">'item'</span><span class="p">);</span> +<span class="nv">$this</span><span class="o">-></span><span class="na">session</span><span class="o">-></span><span class="na">keep_flashdata</span><span class="p">(</span><span class="k">array</span><span class="p">(</span><span class="s1">'item1'</span><span class="p">,</span> <span class="s1">'item2'</span><span class="p">,</span> <span class="s1">'item3'</span><span class="p">));</span> +</pre></div> +</div> +</div> +<div class="section" id="tempdata"> +<h3><a class="toc-backref" href="#id12">Tempdata</a><a class="headerlink" href="#tempdata" title="Permalink to this headline">¶</a></h3> +<p>CodeIgniter also supports “tempdata”, or session data with a specific +expiration time. After the value expires, or the session expires or is +deleted, the value is automatically removed.</p> +<p>Similarly to flashdata, tempdata variables are regular session vars that +are marked in a specific way under the ‘__ci_vars’ key (again, don’t touch +that one).</p> +<p>To mark an existing item as “tempdata”, simply pass its key and expiry time +(in seconds!) to the <code class="docutils literal"><span class="pre">mark_as_temp()</span></code> method:</p> +<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="c1">// 'item' will be erased after 300 seconds</span> +<span class="nv">$this</span><span class="o">-></span><span class="na">session</span><span class="o">-></span><span class="na">mark_as_temp</span><span class="p">(</span><span class="s1">'item'</span><span class="p">,</span> <span class="mi">300</span><span class="p">);</span> +</pre></div> +</div> +<p>You can mark multiple items as tempdata in two ways, depending on whether +you want them all to have the same expiry time or not:</p> +<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="c1">// Both 'item' and 'item2' will expire after 300 seconds</span> +<span class="nv">$this</span><span class="o">-></span><span class="na">session</span><span class="o">-></span><span class="na">mark_as_temp</span><span class="p">(</span><span class="k">array</span><span class="p">(</span><span class="s1">'item'</span><span class="p">,</span> <span class="s1">'item2'</span><span class="p">),</span> <span class="mi">300</span><span class="p">);</span> + +<span class="c1">// 'item' will be erased after 300 seconds, while 'item2'</span> +<span class="c1">// will do so after only 240 seconds</span> +<span class="nv">$this</span><span class="o">-></span><span class="na">session</span><span class="o">-></span><span class="na">mark_as_temp</span><span class="p">(</span><span class="k">array</span><span class="p">(</span> + <span class="s1">'item'</span> <span class="o">=></span> <span class="mi">300</span><span class="p">,</span> + <span class="s1">'item2'</span> <span class="o">=></span> <span class="mi">240</span> +<span class="p">));</span> +</pre></div> +</div> +<p>To add tempdata:</p> +<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$_SESSION</span><span class="p">[</span><span class="s1">'item'</span><span class="p">]</span> <span class="o">=</span> <span class="s1">'value'</span><span class="p">;</span> +<span class="nv">$this</span><span class="o">-></span><span class="na">session</span><span class="o">-></span><span class="na">mark_as_temp</span><span class="p">(</span><span class="s1">'item'</span><span class="p">,</span> <span class="mi">300</span><span class="p">);</span> <span class="c1">// Expire in 5 minutes</span> +</pre></div> +</div> +<p>Or alternatively, using the <code class="docutils literal"><span class="pre">set_tempdata()</span></code> method:</p> +<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-></span><span class="na">session</span><span class="o">-></span><span class="na">set_tempdata</span><span class="p">(</span><span class="s1">'item'</span><span class="p">,</span> <span class="s1">'value'</span><span class="p">,</span> <span class="mi">300</span><span class="p">);</span> +</pre></div> +</div> +<p>You can also pass an array to <code class="docutils literal"><span class="pre">set_tempdata()</span></code>:</p> +<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$tempdata</span> <span class="o">=</span> <span class="k">array</span><span class="p">(</span><span class="s1">'newuser'</span> <span class="o">=></span> <span class="k">TRUE</span><span class="p">,</span> <span class="s1">'message'</span> <span class="o">=></span> <span class="s1">'Thanks for joining!'</span><span class="p">);</span> + +<span class="nv">$this</span><span class="o">-></span><span class="na">session</span><span class="o">-></span><span class="na">set_tempdata</span><span class="p">(</span><span class="nv">$tempdata</span><span class="p">,</span> <span class="k">NULL</span><span class="p">,</span> <span class="nv">$expire</span><span class="p">);</span> +</pre></div> +</div> +<div class="admonition note"> +<p class="first admonition-title">Note</p> +<p class="last">If the expiration is omitted or set to 0, the default +time-to-live value of 300 seconds (or 5 minutes) will be used.</p> +</div> +<p>To read a tempdata variable, again you can just access it through the +<code class="docutils literal"><span class="pre">$_SESSION</span></code> superglobal array:</p> +<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$_SESSION</span><span class="p">[</span><span class="s1">'item'</span><span class="p">]</span> +</pre></div> +</div> +<div class="admonition important"> +<p class="first admonition-title">Important</p> +<p class="last">The <code class="docutils literal"><span class="pre">userdata()</span></code> method will NOT return tempdata items.</p> +</div> +<p>Or if you want to be sure that you’re reading “tempdata” (and not any +other kind), you can also use the <code class="docutils literal"><span class="pre">tempdata()</span></code> method:</p> +<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-></span><span class="na">session</span><span class="o">-></span><span class="na">tempdata</span><span class="p">(</span><span class="s1">'item'</span><span class="p">);</span> +</pre></div> +</div> +<p>And of course, if you want to retrieve all existing tempdata:</p> +<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-></span><span class="na">session</span><span class="o">-></span><span class="na">tempdata</span><span class="p">();</span> +</pre></div> +</div> +<div class="admonition note"> +<p class="first admonition-title">Note</p> +<p class="last">The <code class="docutils literal"><span class="pre">tempdata()</span></code> method returns NULL if the item cannot be +found.</p> +</div> +<p>If you need to remove a tempdata value before it expires, you can directly +unset it from the <code class="docutils literal"><span class="pre">$_SESSION</span></code> array:</p> +<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nb">unset</span><span class="p">(</span><span class="nv">$_SESSION</span><span class="p">[</span><span class="s1">'item'</span><span class="p">]);</span> +</pre></div> +</div> +<p>However, this won’t remove the marker that makes this specific item to be +tempdata (it will be invalidated on the next HTTP request), so if you +intend to reuse that same key in the same request, you’d want to use +<code class="docutils literal"><span class="pre">unset_tempdata()</span></code>:</p> +<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-></span><span class="na">session</span><span class="o">-></span><span class="na">unset_tempdata</span><span class="p">(</span><span class="s1">'item'</span><span class="p">);</span> +</pre></div> +</div> +</div> +<div class="section" id="destroying-a-session"> +<h3><a class="toc-backref" href="#id13">Destroying a Session</a><a class="headerlink" href="#destroying-a-session" title="Permalink to this headline">¶</a></h3> +<p>To clear the current session (for example, during a logout), you may +simply use either PHP’s <a class="reference external" href="http://php.net/session_destroy">session_destroy()</a> +function, or the <code class="docutils literal"><span class="pre">sess_destroy()</span></code> method. Both will work in exactly the +same way:</p> +<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nb">session_destroy</span><span class="p">();</span> + +<span class="c1">// or</span> + +<span class="nv">$this</span><span class="o">-></span><span class="na">session</span><span class="o">-></span><span class="na">sess_destroy</span><span class="p">();</span> +</pre></div> +</div> +<div class="admonition note"> +<p class="first admonition-title">Note</p> +<p class="last">This must be the last session-related operation that you do +during the same request. All session data (including flashdata and +tempdata) will be destroyed permanently and functions will be +unusable during the same request after you destroy the session.</p> +</div> +</div> +<div class="section" id="accessing-session-metadata"> +<h3><a class="toc-backref" href="#id14">Accessing session metadata</a><a class="headerlink" href="#accessing-session-metadata" title="Permalink to this headline">¶</a></h3> +<p>In previous CodeIgniter versions, the session data array included 4 items +by default: ‘session_id’, ‘ip_address’, ‘user_agent’, ‘last_activity’.</p> +<p>This was due to the specifics of how sessions worked, but is now no longer +necessary with our new implementation. However, it may happen that your +application relied on these values, so here are alternative methods of +accessing them:</p> +<blockquote> +<div><ul class="simple"> +<li>session_id: <code class="docutils literal"><span class="pre">session_id()</span></code></li> +<li>ip_address: <code class="docutils literal"><span class="pre">$_SERVER['REMOTE_ADDR']</span></code></li> +<li>user_agent: <code class="docutils literal"><span class="pre">$this->input->user_agent()</span></code> (unused by sessions)</li> +<li>last_activity: Depends on the storage, no straightforward way. Sorry!</li> +</ul> +</div></blockquote> +</div> +<div class="section" id="session-preferences"> +<h3><a class="toc-backref" href="#id15">Session Preferences</a><a class="headerlink" href="#session-preferences" title="Permalink to this headline">¶</a></h3> +<p>CodeIgniter will usually make everything work out of the box. However, +Sessions are a very sensitive component of any application, so some +careful configuration must be done. Please take your time to consider +all of the options and their effects.</p> +<p>You’ll find the following Session related preferences in your +<strong>application/config/config.php</strong> file:</p> +<table border="1" class="docutils"> +<colgroup> +<col width="16%" /> +<col width="9%" /> +<col width="23%" /> +<col width="53%" /> +</colgroup> +<thead valign="bottom"> +<tr class="row-odd"><th class="head">Preference</th> +<th class="head">Default</th> +<th class="head">Options</th> +<th class="head">Description</th> +</tr> +</thead> +<tbody valign="top"> +<tr class="row-even"><td><strong>sess_driver</strong></td> +<td>files</td> +<td>files/database/redis/memcached/<em>custom</em></td> +<td>The session storage driver to use.</td> +</tr> +<tr class="row-odd"><td><strong>sess_cookie_name</strong></td> +<td>ci_session</td> +<td>[A-Za-z_-] characters only</td> +<td>The name used for the session cookie.</td> +</tr> +<tr class="row-even"><td><strong>sess_expiration</strong></td> +<td>7200 (2 hours)</td> +<td>Time in seconds (integer)</td> +<td>The number of seconds you would like the session to last. +If you would like a non-expiring session (until browser is closed) set the value to zero: 0</td> +</tr> +<tr class="row-odd"><td><strong>sess_save_path</strong></td> +<td>NULL</td> +<td>None</td> +<td>Specifies the storage location, depends on the driver being used.</td> +</tr> +<tr class="row-even"><td><strong>sess_match_ip</strong></td> +<td>FALSE</td> +<td>TRUE/FALSE (boolean)</td> +<td>Whether to validate the user’s IP address when reading the session cookie. +Note that some ISPs dynamically changes the IP, so if you want a non-expiring session you +will likely set this to FALSE.</td> +</tr> +<tr class="row-odd"><td><strong>sess_time_to_update</strong></td> +<td>300</td> +<td>Time in seconds (integer)</td> +<td>This option controls how often the session class will regenerate itself and create a new +session ID. Setting it to 0 will disable session ID regeneration.</td> +</tr> +<tr class="row-even"><td><strong>sess_regenerate_destroy</strong></td> +<td>FALSE</td> +<td>TRUE/FALSE (boolean)</td> +<td>Whether to destroy session data associated with the old session ID when auto-regenerating +the session ID. When set to FALSE, the data will be later deleted by the garbage collector.</td> +</tr> +</tbody> +</table> +<div class="admonition note"> +<p class="first admonition-title">Note</p> +<p class="last">As a last resort, the Session library will try to fetch PHP’s +session related INI settings, as well as legacy CI settings such as +‘sess_expire_on_close’ when any of the above is not configured. +However, you should never rely on this behavior as it can cause +unexpected results or be changed in the future. Please configure +everything properly.</p> +</div> +<p>In addition to the values above, the cookie and native drivers apply the +following configuration values shared by the <a class="reference internal" href="input.html"><span class="doc">Input</span></a> and +<a class="reference internal" href="security.html"><span class="doc">Security</span></a> classes:</p> +<table border="1" class="docutils"> +<colgroup> +<col width="17%" /> +<col width="14%" /> +<col width="69%" /> +</colgroup> +<thead valign="bottom"> +<tr class="row-odd"><th class="head">Preference</th> +<th class="head">Default</th> +<th class="head">Description</th> +</tr> +</thead> +<tbody valign="top"> +<tr class="row-even"><td><strong>cookie_domain</strong></td> +<td>‘’</td> +<td>The domain for which the session is applicable</td> +</tr> +<tr class="row-odd"><td><strong>cookie_path</strong></td> +<td>/</td> +<td>The path to which the session is applicable</td> +</tr> +<tr class="row-even"><td><strong>cookie_secure</strong></td> +<td>FALSE</td> +<td>Whether to create the session cookie only on encrypted (HTTPS) connections</td> +</tr> +</tbody> +</table> +<div class="admonition note"> +<p class="first admonition-title">Note</p> +<p class="last">The ‘cookie_httponly’ setting doesn’t have an effect on sessions. +Instead the HttpOnly parameter is always enabled, for security +reasons. Additionally, the ‘cookie_prefix’ setting is completely +ignored.</p> +</div> +</div> +<div class="section" id="session-drivers"> +<h3><a class="toc-backref" href="#id16">Session Drivers</a><a class="headerlink" href="#session-drivers" title="Permalink to this headline">¶</a></h3> +<p>As already mentioned, the Session library comes with 4 drivers, or storage +engines, that you can use:</p> +<blockquote> +<div><ul class="simple"> +<li>files</li> +<li>database</li> +<li>redis</li> +<li>memcached</li> +</ul> +</div></blockquote> +<p>By default, the <a class="reference internal" href="#files-driver">Files Driver</a> will be used when a session is initialized, +because it is the most safe choice and is expected to work everywhere +(virtually every environment has a file system).</p> +<p>However, any other driver may be selected via the <code class="docutils literal"><span class="pre">$config['sess_driver']</span></code> +line in your <strong>application/config/config.php</strong> file, if you chose to do so. +Have it in mind though, every driver has different caveats, so be sure to +get yourself familiar with them (below) before you make that choice.</p> +<p>In addition, you may also create and use <a class="reference internal" href="#custom-drivers">Custom Drivers</a>, if the ones +provided by default don’t satisfy your use case.</p> +<div class="admonition note"> +<p class="first admonition-title">Note</p> +<p class="last">In previous CodeIgniter versions, a different, “cookie driver” +was the only option and we have received negative feedback on not +providing that option. While we do listen to feedback from the +community, we want to warn you that it was dropped because it is +<strong>unsafe</strong> and we advise you NOT to try to replicate it via a +custom driver.</p> +</div> +<div class="section" id="files-driver"> +<h4><a class="toc-backref" href="#id17">Files Driver</a><a class="headerlink" href="#files-driver" title="Permalink to this headline">¶</a></h4> +<p>The ‘files’ driver uses your file system for storing session data.</p> +<p>It can safely be said that it works exactly like PHP’s own default session +implementation, but in case this is an important detail for you, have it +mind that it is in fact not the same code and it has some limitations +(and advantages).</p> +<p>To be more specific, it doesn’t support PHP’s <a class="reference external" href="http://php.net/manual/en/session.configuration.php#ini.session.save-path">directory level and mode +formats used in session.save_path</a>, +and it has most of the options hard-coded for safety. Instead, only +absolute paths are supported for <code class="docutils literal"><span class="pre">$config['sess_save_path']</span></code>.</p> +<p>Another important thing that you should know, is to make sure that you +don’t use a publicly-readable or shared directory for storing your session +files. Make sure that <em>only you</em> have access to see the contents of your +chosen <em>sess_save_path</em> directory. Otherwise, anybody who can do that, can +also steal any of the current sessions (also known as “session fixation” +attack).</p> +<p>On UNIX-like operating systems, this is usually achieved by setting the +0700 mode permissions on that directory via the <cite>chmod</cite> command, which +allows only the directory’s owner to perform read and write operations on +it. But be careful because the system user <em>running</em> the script is usually +not your own, but something like ‘www-data’ instead, so only setting those +permissions will probable break your application.</p> +<p>Instead, you should do something like this, depending on your environment</p> +<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nb">mkdir</span> <span class="o">/<</span><span class="nx">path</span> <span class="nx">to</span> <span class="nx">your</span> <span class="nx">application</span> <span class="nx">directory</span><span class="o">>/</span><span class="nx">sessions</span><span class="o">/</span> +<span class="nb">chmod</span> <span class="mo">0700</span> <span class="o">/<</span><span class="nx">path</span> <span class="nx">to</span> <span class="nx">your</span> <span class="nx">application</span> <span class="nx">directory</span><span class="o">>/</span><span class="nx">sessions</span><span class="o">/</span> +<span class="nb">chown</span> <span class="nx">www</span><span class="o">-</span><span class="nx">data</span> <span class="o">/<</span><span class="nx">path</span> <span class="nx">to</span> <span class="nx">your</span> <span class="nx">application</span> <span class="nx">directory</span><span class="o">>/</span><span class="nx">sessions</span><span class="o">/</span> +</pre></div> +</div> +<div class="section" id="bonus-tip"> +<h5><a class="toc-backref" href="#id18">Bonus Tip</a><a class="headerlink" href="#bonus-tip" title="Permalink to this headline">¶</a></h5> +<p>Some of you will probably opt to choose another session driver because +file storage is usually slower. This is only half true.</p> +<p>A very basic test will probably trick you into believing that an SQL +database is faster, but in 99% of the cases, this is only true while you +only have a few current sessions. As the sessions count and server loads +increase - which is the time when it matters - the file system will +consistently outperform almost all relational database setups.</p> +<p>In addition, if performance is your only concern, you may want to look +into using <a class="reference external" href="http://eddmann.com/posts/storing-php-sessions-file-caches-in-memory-using-tmpfs/">tmpfs</a>, +(warning: external resource), which can make your sessions blazing fast.</p> +</div> +</div> +<div class="section" id="database-driver"> +<h4><a class="toc-backref" href="#id19">Database Driver</a><a class="headerlink" href="#database-driver" title="Permalink to this headline">¶</a></h4> +<p>The ‘database’ driver uses a relational database such as MySQL or +PostgreSQL to store sessions. This is a popular choice among many users, +because it allows the developer easy access to the session data within +an application - it is just another table in your database.</p> +<p>However, there are some conditions that must be met:</p> +<blockquote> +<div><ul class="simple"> +<li>Only your <strong>default</strong> database connection (or the one that you access +as <code class="docutils literal"><span class="pre">$this->db</span></code> from your controllers) can be used.</li> +<li>You must have the <a class="reference internal" href="../database/query_builder.html"><span class="doc">Query Builder</span></a> +enabled.</li> +<li>You can NOT use a persistent connection.</li> +<li>You can NOT use a connection with the <em>cache_on</em> setting enabled.</li> +</ul> +</div></blockquote> +<p>In order to use the ‘database’ session driver, you must also create this +table that we already mentioned and then set it as your +<code class="docutils literal"><span class="pre">$config['sess_save_path']</span></code> value. +For example, if you would like to use ‘ci_sessions’ as your table name, +you would do this:</p> +<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$config</span><span class="p">[</span><span class="s1">'sess_driver'</span><span class="p">]</span> <span class="o">=</span> <span class="s1">'database'</span><span class="p">;</span> +<span class="nv">$config</span><span class="p">[</span><span class="s1">'sess_save_path'</span><span class="p">]</span> <span class="o">=</span> <span class="s1">'ci_sessions'</span><span class="p">;</span> +</pre></div> +</div> +<div class="admonition note"> +<p class="first admonition-title">Note</p> +<p class="last">If you’ve upgraded from a previous version of CodeIgniter and +you don’t have ‘sess_save_path’ configured, then the Session +library will look for the old ‘sess_table_name’ setting and use +it instead. Please don’t rely on this behavior as it will get +removed in the future.</p> +</div> +<p>And then of course, create the database table …</p> +<p>For MySQL:</p> +<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nx">CREATE</span> <span class="nx">TABLE</span> <span class="k">IF</span> <span class="k">NOT</span> <span class="nx">EXISTS</span> <span class="sb">`ci_sessions`</span> <span class="p">(</span> + <span class="sb">`id`</span> <span class="nx">varchar</span><span class="p">(</span><span class="mi">128</span><span class="p">)</span> <span class="k">NOT</span> <span class="k">NULL</span><span class="p">,</span> + <span class="sb">`ip_address`</span> <span class="nx">varchar</span><span class="p">(</span><span class="mi">45</span><span class="p">)</span> <span class="k">NOT</span> <span class="k">NULL</span><span class="p">,</span> + <span class="sb">`timestamp`</span> <span class="nx">int</span><span class="p">(</span><span class="mi">10</span><span class="p">)</span> <span class="nx">unsigned</span> <span class="k">DEFAULT</span> <span class="mi">0</span> <span class="k">NOT</span> <span class="k">NULL</span><span class="p">,</span> + <span class="sb">`data`</span> <span class="nx">blob</span> <span class="k">NOT</span> <span class="k">NULL</span><span class="p">,</span> + <span class="nx">KEY</span> <span class="sb">`ci_sessions_timestamp`</span> <span class="p">(</span><span class="sb">`timestamp`</span><span class="p">)</span> +<span class="p">);</span> +</pre></div> +</div> +<p>For PostgreSQL:</p> +<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nx">CREATE</span> <span class="nx">TABLE</span> <span class="s2">"ci_sessions"</span> <span class="p">(</span> + <span class="s2">"id"</span> <span class="nx">varchar</span><span class="p">(</span><span class="mi">128</span><span class="p">)</span> <span class="k">NOT</span> <span class="k">NULL</span><span class="p">,</span> + <span class="s2">"ip_address"</span> <span class="nx">varchar</span><span class="p">(</span><span class="mi">45</span><span class="p">)</span> <span class="k">NOT</span> <span class="k">NULL</span><span class="p">,</span> + <span class="s2">"timestamp"</span> <span class="nx">bigint</span> <span class="k">DEFAULT</span> <span class="mi">0</span> <span class="k">NOT</span> <span class="k">NULL</span><span class="p">,</span> + <span class="s2">"data"</span> <span class="nx">text</span> <span class="k">DEFAULT</span> <span class="s1">''</span> <span class="k">NOT</span> <span class="k">NULL</span> +<span class="p">);</span> + +<span class="nx">CREATE</span> <span class="nx">INDEX</span> <span class="s2">"ci_sessions_timestamp"</span> <span class="nx">ON</span> <span class="s2">"ci_sessions"</span> <span class="p">(</span><span class="s2">"timestamp"</span><span class="p">);</span> +</pre></div> +</div> +<p>You will also need to add a PRIMARY KEY <strong>depending on your ‘sess_match_ip’ +setting</strong>. The examples below work both on MySQL and PostgreSQL:</p> +<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="c1">// When sess_match_ip = TRUE</span> +<span class="nx">ALTER</span> <span class="nx">TABLE</span> <span class="nx">ci_sessions</span> <span class="nx">ADD</span> <span class="nx">PRIMARY</span> <span class="nx">KEY</span> <span class="p">(</span><span class="nx">id</span><span class="p">,</span> <span class="nx">ip_address</span><span class="p">);</span> + +<span class="c1">// When sess_match_ip = FALSE</span> +<span class="nx">ALTER</span> <span class="nx">TABLE</span> <span class="nx">ci_sessions</span> <span class="nx">ADD</span> <span class="nx">PRIMARY</span> <span class="nx">KEY</span> <span class="p">(</span><span class="nx">id</span><span class="p">);</span> + +<span class="c1">// To drop a previously created primary key (use when changing the setting)</span> +<span class="nx">ALTER</span> <span class="nx">TABLE</span> <span class="nx">ci_sessions</span> <span class="nx">DROP</span> <span class="nx">PRIMARY</span> <span class="nx">KEY</span><span class="p">;</span> +</pre></div> +</div> +<div class="admonition important"> +<p class="first admonition-title">Important</p> +<p class="last">Only MySQL and PostgreSQL databases are officially +supported, due to lack of advisory locking mechanisms on other +platforms. Using sessions without locks can cause all sorts of +problems, especially with heavy usage of AJAX, and we will not +support such cases. Use <code class="docutils literal"><span class="pre">session_write_close()</span></code> after you’ve +done processing session data if you’re having performance +issues.</p> +</div> +</div> +<div class="section" id="redis-driver"> +<h4><a class="toc-backref" href="#id20">Redis Driver</a><a class="headerlink" href="#redis-driver" title="Permalink to this headline">¶</a></h4> +<div class="admonition note"> +<p class="first admonition-title">Note</p> +<p class="last">Since Redis doesn’t have a locking mechanism exposed, locks for +this driver are emulated by a separate value that is kept for up +to 300 seconds.</p> +</div> +<p>Redis is a storage engine typically used for caching and popular because +of its high performance, which is also probably your reason to use the +‘redis’ session driver.</p> +<p>The downside is that it is not as ubiquitous as relational databases and +requires the <a class="reference external" href="https://github.com/phpredis/phpredis">phpredis</a> PHP +extension to be installed on your system, and that one doesn’t come +bundled with PHP. +Chances are, you’re only be using the ‘redis’ driver only if you’re already +both familiar with Redis and using it for other purposes.</p> +<p>Just as with the ‘files’ and ‘database’ drivers, you must also configure +the storage location for your sessions via the +<code class="docutils literal"><span class="pre">$config['sess_save_path']</span></code> setting. +The format here is a bit different and complicated at the same time. It is +best explained by the <em>phpredis</em> extension’s README file, so we’ll simply +link you to it:</p> +<blockquote> +<div><a class="reference external" href="https://github.com/phpredis/phpredis#php-session-handler">https://github.com/phpredis/phpredis#php-session-handler</a></div></blockquote> +<div class="admonition warning"> +<p class="first admonition-title">Warning</p> +<p class="last">CodeIgniter’s Session library does NOT use the actual ‘redis’ +<code class="docutils literal"><span class="pre">session.save_handler</span></code>. Take note <strong>only</strong> of the path format in +the link above.</p> +</div> +<p>For the most common case however, a simple <code class="docutils literal"><span class="pre">host:port</span></code> pair should be +sufficient:</p> +<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$config</span><span class="p">[</span><span class="s1">'sess_driver'</span><span class="p">]</span> <span class="o">=</span> <span class="s1">'redis'</span><span class="p">;</span> +<span class="nv">$config</span><span class="p">[</span><span class="s1">'sess_save_path'</span><span class="p">]</span> <span class="o">=</span> <span class="s1">'tcp://localhost:6379'</span><span class="p">;</span> +</pre></div> +</div> +</div> +<div class="section" id="memcached-driver"> +<h4><a class="toc-backref" href="#id21">Memcached Driver</a><a class="headerlink" href="#memcached-driver" title="Permalink to this headline">¶</a></h4> +<div class="admonition note"> +<p class="first admonition-title">Note</p> +<p class="last">Since Memcache doesn’t have a locking mechanism exposed, locks +for this driver are emulated by a separate value that is kept for +up to 300 seconds.</p> +</div> +<p>The ‘memcached’ driver is very similar to the ‘redis’ one in all of its +properties, except perhaps for availability, because PHP’s <a class="reference external" href="http://php.net/memcached">Memcached</a> extension is distributed via PECL and some +Linux distrubutions make it available as an easy to install package.</p> +<p>Other than that, and without any intentional bias towards Redis, there’s +not much different to be said about Memcached - it is also a popular +product that is usually used for caching and famed for its speed.</p> +<p>However, it is worth noting that the only guarantee given by Memcached +is that setting value X to expire after Y seconds will result in it being +deleted after Y seconds have passed (but not necessarily that it won’t +expire earlier than that time). This happens very rarely, but should be +considered as it may result in loss of sessions.</p> +<p>The <code class="docutils literal"><span class="pre">$config['sess_save_path']</span></code> format is fairly straightforward here, +being just a <code class="docutils literal"><span class="pre">host:port</span></code> pair:</p> +<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$config</span><span class="p">[</span><span class="s1">'sess_driver'</span><span class="p">]</span> <span class="o">=</span> <span class="s1">'memcached'</span><span class="p">;</span> +<span class="nv">$config</span><span class="p">[</span><span class="s1">'sess_save_path'</span><span class="p">]</span> <span class="o">=</span> <span class="s1">'localhost:11211'</span><span class="p">;</span> +</pre></div> +</div> +<div class="section" id="id1"> +<h5><a class="toc-backref" href="#id22">Bonus Tip</a><a class="headerlink" href="#id1" title="Permalink to this headline">¶</a></h5> +<p>Multi-server configuration with an optional <em>weight</em> parameter as the +third colon-separated (<code class="docutils literal"><span class="pre">:weight</span></code>) value is also supported, but we have +to note that we haven’t tested if that is reliable.</p> +<p>If you want to experiment with this feature (on your own risk), simply +separate the multiple server paths with commas:</p> +<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="c1">// localhost will be given higher priority (5) here,</span> +<span class="c1">// compared to 192.0.2.1 with a weight of 1.</span> +<span class="nv">$config</span><span class="p">[</span><span class="s1">'sess_save_path'</span><span class="p">]</span> <span class="o">=</span> <span class="s1">'localhost:11211:5,192.0.2.1:11211:1'</span><span class="p">;</span> +</pre></div> +</div> +</div> +</div> +<div class="section" id="custom-drivers"> +<h4><a class="toc-backref" href="#id23">Custom Drivers</a><a class="headerlink" href="#custom-drivers" title="Permalink to this headline">¶</a></h4> +<p>You may also create your own, custom session drivers. However, have it in +mind that this is typically not an easy task, as it takes a lot of +knowledge to do it properly.</p> +<p>You need to know not only how sessions work in general, but also how they +work specifically in PHP, how the underlying storage mechanism works, how +to handle concurrency, avoid deadlocks (but NOT through lack of locks) and +last but not least - how to handle the potential security issues, which +is far from trivial.</p> +<p>Long story short - if you don’t know how to do that already in raw PHP, +you shouldn’t be trying to do it within CodeIgniter either. You’ve been +warned.</p> +<p>If you only want to add some extra functionality to your sessions, just +extend the base Session class, which is a lot more easier. Read the +<a class="reference internal" href="../general/creating_libraries.html"><span class="doc">Creating Libraries</span></a> article to +learn how to do that.</p> +<p>Now, to the point - there are three general rules that you must follow +when creating a session driver for CodeIgniter:</p> +<blockquote> +<div><ul> +<li><p class="first">Put your driver’s file under <strong>application/libraries/Session/drivers/</strong> +and follow the naming conventions used by the Session class.</p> +<p>For example, if you were to create a ‘dummy’ driver, you would have +a <code class="docutils literal"><span class="pre">Session_dummy_driver</span></code> class name, that is declared in +<em>application/libraries/Session/drivers/Session_dummy_driver.php</em>.</p> +</li> +<li><p class="first">Extend the <code class="docutils literal"><span class="pre">CI_Session_driver</span></code> class.</p> +<p>This is just a basic class with a few internal helper methods. It is +also extendable like any other library, if you really need to do that, +but we are not going to explain how … if you’re familiar with how +class extensions/overrides work in CI, then you already know how to do +it. If not, well, you shouldn’t be doing it in the first place.</p> +</li> +<li><p class="first">Implement the <a class="reference external" href="http://php.net/sessionhandlerinterface">SessionHandlerInterface</a> interface.</p> +<div class="admonition note"> +<p class="first admonition-title">Note</p> +<p class="last">You may notice that <code class="docutils literal"><span class="pre">SessionHandlerInterface</span></code> is provided +by PHP since version 5.4.0. CodeIgniter will automatically declare +the same interface if you’re running an older PHP version.</p> +</div> +<p>The link will explain why and how.</p> +</li> +</ul> +</div></blockquote> +<p>So, based on our ‘dummy’ driver example above, you’d end up with something +like this:</p> +<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="c1">// application/libraries/Session/drivers/Session_dummy_driver.php:</span> + +<span class="k">class</span> <span class="nc">CI_Session_dummy_driver</span> <span class="k">extends</span> <span class="nx">CI_Session_driver</span> <span class="k">implements</span> <span class="nx">SessionHandlerInterface</span> +<span class="p">{</span> + + <span class="k">public</span> <span class="k">function</span> <span class="nf">__construct</span><span class="p">(</span><span class="o">&</span><span class="nv">$params</span><span class="p">)</span> + <span class="p">{</span> + <span class="c1">// DO NOT forget this</span> + <span class="k">parent</span><span class="o">::</span><span class="na">__construct</span><span class="p">(</span><span class="nv">$params</span><span class="p">);</span> + + <span class="c1">// Configuration & other initializations</span> + <span class="p">}</span> + + <span class="k">public</span> <span class="k">function</span> <span class="nf">open</span><span class="p">(</span><span class="nv">$save_path</span><span class="p">,</span> <span class="nv">$name</span><span class="p">)</span> + <span class="p">{</span> + <span class="c1">// Initialize storage mechanism (connection)</span> + <span class="p">}</span> + + <span class="k">public</span> <span class="k">function</span> <span class="nf">read</span><span class="p">(</span><span class="nv">$session_id</span><span class="p">)</span> + <span class="p">{</span> + <span class="c1">// Read session data (if exists), acquire locks</span> + <span class="p">}</span> + + <span class="k">public</span> <span class="k">function</span> <span class="nf">write</span><span class="p">(</span><span class="nv">$session_id</span><span class="p">,</span> <span class="nv">$session_data</span><span class="p">)</span> + <span class="p">{</span> + <span class="c1">// Create / update session data (it might not exist!)</span> + <span class="p">}</span> + + <span class="k">public</span> <span class="k">function</span> <span class="nf">close</span><span class="p">()</span> + <span class="p">{</span> + <span class="c1">// Free locks, close connections / streams / etc.</span> + <span class="p">}</span> + + <span class="k">public</span> <span class="k">function</span> <span class="nf">destroy</span><span class="p">(</span><span class="nv">$session_id</span><span class="p">)</span> + <span class="p">{</span> + <span class="c1">// Call close() method & destroy data for current session (order may differ)</span> + <span class="p">}</span> + + <span class="k">public</span> <span class="k">function</span> <span class="nf">gc</span><span class="p">(</span><span class="nv">$maxlifetime</span><span class="p">)</span> + <span class="p">{</span> + <span class="c1">// Erase data for expired sessions</span> + <span class="p">}</span> + +<span class="p">}</span> +</pre></div> +</div> +<p>If you’ve done everything properly, you can now set your <em>sess_driver</em> +configuration value to ‘dummy’ and use your own driver. Congratulations!</p> +</div> +</div> +</div> +<div class="section" id="class-reference"> +<h2><a class="toc-backref" href="#id24">Class Reference</a><a class="headerlink" href="#class-reference" title="Permalink to this headline">¶</a></h2> +<dl class="class"> +<dt id="CI_Session"> +<em class="property">class </em><code class="descname">CI_Session</code><a class="headerlink" href="#CI_Session" title="Permalink to this definition">¶</a></dt> +<dd><dl class="method"> +<dt id="CI_Session::userdata"> +<code class="descname">userdata</code><span class="sig-paren">(</span><span class="optional">[</span><em>$key = NULL</em><span class="optional">]</span><span class="sig-paren">)</span><a class="headerlink" href="#CI_Session::userdata" title="Permalink to this definition">¶</a></dt> +<dd><table class="docutils field-list" frame="void" rules="none"> +<col class="field-name" /> +<col class="field-body" /> +<tbody valign="top"> +<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple"> +<li><strong>$key</strong> (<em>mixed</em>) – Session item key or NULL</li> +</ul> +</td> +</tr> +<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">Value of the specified item key, or an array of all userdata</p> +</td> +</tr> +<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">mixed</p> +</td> +</tr> +</tbody> +</table> +<p>Gets the value for a specific <code class="docutils literal"><span class="pre">$_SESSION</span></code> item, or an +array of all “userdata” items if not key was specified.</p> +<div class="admonition note"> +<p class="first admonition-title">Note</p> +<p class="last">This is a legacy method kept only for backwards +compatibility with older applications. You should +directly access <code class="docutils literal"><span class="pre">$_SESSION</span></code> instead.</p> +</div> +</dd></dl> + +<dl class="method"> +<dt id="CI_Session::all_userdata"> +<code class="descname">all_userdata</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#CI_Session::all_userdata" title="Permalink to this definition">¶</a></dt> +<dd><table class="docutils field-list" frame="void" rules="none"> +<col class="field-name" /> +<col class="field-body" /> +<tbody valign="top"> +<tr class="field-odd field"><th class="field-name">Returns:</th><td class="field-body">An array of all userdata</td> +</tr> +<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body">array</td> +</tr> +</tbody> +</table> +<p>Returns an array containing all “userdata” items.</p> +<div class="admonition note"> +<p class="first admonition-title">Note</p> +<p class="last">This method is DEPRECATED. Use <code class="docutils literal"><span class="pre">userdata()</span></code> +with no parameters instead.</p> +</div> +</dd></dl> + +<dl class="method"> +<dt> +<code class="descname">&get_userdata()</code></dt> +<dd><table class="docutils field-list" frame="void" rules="none"> +<col class="field-name" /> +<col class="field-body" /> +<tbody valign="top"> +<tr class="field-odd field"><th class="field-name">Returns:</th><td class="field-body">A reference to <code class="docutils literal"><span class="pre">$_SESSION</span></code></td> +</tr> +<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body">array</td> +</tr> +</tbody> +</table> +<p>Returns a reference to the <code class="docutils literal"><span class="pre">$_SESSION</span></code> array.</p> +<div class="admonition note"> +<p class="first admonition-title">Note</p> +<p class="last">This is a legacy method kept only for backwards +compatibility with older applications.</p> +</div> +</dd></dl> + +<dl class="method"> +<dt id="CI_Session::has_userdata"> +<code class="descname">has_userdata</code><span class="sig-paren">(</span><em>$key</em><span class="sig-paren">)</span><a class="headerlink" href="#CI_Session::has_userdata" title="Permalink to this definition">¶</a></dt> +<dd><table class="docutils field-list" frame="void" rules="none"> +<col class="field-name" /> +<col class="field-body" /> +<tbody valign="top"> +<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple"> +<li><strong>$key</strong> (<em>string</em>) – Session item key</li> +</ul> +</td> +</tr> +<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">TRUE if the specified key exists, FALSE if not</p> +</td> +</tr> +<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">bool</p> +</td> +</tr> +</tbody> +</table> +<p>Checks if an item exists in <code class="docutils literal"><span class="pre">$_SESSION</span></code>.</p> +<div class="admonition note"> +<p class="first admonition-title">Note</p> +<p class="last">This is a legacy method kept only for backwards +compatibility with older applications. It is just +an alias for <code class="docutils literal"><span class="pre">isset($_SESSION[$key])</span></code> - please +use that instead.</p> +</div> +</dd></dl> + +<dl class="method"> +<dt id="CI_Session::set_userdata"> +<code class="descname">set_userdata</code><span class="sig-paren">(</span><em>$data</em><span class="optional">[</span>, <em>$value = NULL</em><span class="optional">]</span><span class="sig-paren">)</span><a class="headerlink" href="#CI_Session::set_userdata" title="Permalink to this definition">¶</a></dt> +<dd><table class="docutils field-list" frame="void" rules="none"> +<col class="field-name" /> +<col class="field-body" /> +<tbody valign="top"> +<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple"> +<li><strong>$data</strong> (<em>mixed</em>) – An array of key/value pairs to set as session data, or the key for a single item</li> +<li><strong>$value</strong> (<em>mixed</em>) – The value to set for a specific session item, if $data is a key</li> +</ul> +</td> +</tr> +<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">void</p> +</td> +</tr> +</tbody> +</table> +<p>Assigns data to the <code class="docutils literal"><span class="pre">$_SESSION</span></code> superglobal.</p> +<div class="admonition note"> +<p class="first admonition-title">Note</p> +<p class="last">This is a legacy method kept only for backwards +compatibility with older applications.</p> +</div> +</dd></dl> + +<dl class="method"> +<dt id="CI_Session::unset_userdata"> +<code class="descname">unset_userdata</code><span class="sig-paren">(</span><em>$key</em><span class="sig-paren">)</span><a class="headerlink" href="#CI_Session::unset_userdata" title="Permalink to this definition">¶</a></dt> +<dd><table class="docutils field-list" frame="void" rules="none"> +<col class="field-name" /> +<col class="field-body" /> +<tbody valign="top"> +<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple"> +<li><strong>$key</strong> (<em>mixed</em>) – Key for the session data item to unset, or an array of multiple keys</li> +</ul> +</td> +</tr> +<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">void</p> +</td> +</tr> +</tbody> +</table> +<p>Unsets the specified key(s) from the <code class="docutils literal"><span class="pre">$_SESSION</span></code> +superglobal.</p> +<div class="admonition note"> +<p class="first admonition-title">Note</p> +<p class="last">This is a legacy method kept only for backwards +compatibility with older applications. It is just +an alias for <code class="docutils literal"><span class="pre">unset($_SESSION[$key])</span></code> - please +use that instead.</p> +</div> +</dd></dl> + +<dl class="method"> +<dt id="CI_Session::mark_as_flash"> +<code class="descname">mark_as_flash</code><span class="sig-paren">(</span><em>$key</em><span class="sig-paren">)</span><a class="headerlink" href="#CI_Session::mark_as_flash" title="Permalink to this definition">¶</a></dt> +<dd><table class="docutils field-list" frame="void" rules="none"> +<col class="field-name" /> +<col class="field-body" /> +<tbody valign="top"> +<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple"> +<li><strong>$key</strong> (<em>mixed</em>) – Key to mark as flashdata, or an array of multiple keys</li> +</ul> +</td> +</tr> +<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">TRUE on success, FALSE on failure</p> +</td> +</tr> +<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">bool</p> +</td> +</tr> +</tbody> +</table> +<p>Marks a <code class="docutils literal"><span class="pre">$_SESSION</span></code> item key (or multiple ones) as +“flashdata”.</p> +</dd></dl> + +<dl class="method"> +<dt id="CI_Session::get_flash_keys"> +<code class="descname">get_flash_keys</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#CI_Session::get_flash_keys" title="Permalink to this definition">¶</a></dt> +<dd><table class="docutils field-list" frame="void" rules="none"> +<col class="field-name" /> +<col class="field-body" /> +<tbody valign="top"> +<tr class="field-odd field"><th class="field-name">Returns:</th><td class="field-body">Array containing the keys of all “flashdata” items.</td> +</tr> +<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body">array</td> +</tr> +</tbody> +</table> +<p>Gets a list of all <code class="docutils literal"><span class="pre">$_SESSION</span></code> that have been marked as +“flashdata”.</p> +</dd></dl> + +<dl class="method"> +<dt id="CI_Session::unmark_flash"> +<code class="descname">unmark_flash</code><span class="sig-paren">(</span><em>$key</em><span class="sig-paren">)</span><a class="headerlink" href="#CI_Session::unmark_flash" title="Permalink to this definition">¶</a></dt> +<dd><table class="docutils field-list" frame="void" rules="none"> +<col class="field-name" /> +<col class="field-body" /> +<tbody valign="top"> +<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple"> +<li><strong>$key</strong> (<em>mixed</em>) – Key to be un-marked as flashdata, or an array of multiple keys</li> +</ul> +</td> +</tr> +<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">void</p> +</td> +</tr> +</tbody> +</table> +<p>Unmarks a <code class="docutils literal"><span class="pre">$_SESSION</span></code> item key (or multiple ones) as +“flashdata”.</p> +</dd></dl> + +<dl class="method"> +<dt id="CI_Session::flashdata"> +<code class="descname">flashdata</code><span class="sig-paren">(</span><span class="optional">[</span><em>$key = NULL</em><span class="optional">]</span><span class="sig-paren">)</span><a class="headerlink" href="#CI_Session::flashdata" title="Permalink to this definition">¶</a></dt> +<dd><table class="docutils field-list" frame="void" rules="none"> +<col class="field-name" /> +<col class="field-body" /> +<tbody valign="top"> +<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple"> +<li><strong>$key</strong> (<em>mixed</em>) – Flashdata item key or NULL</li> +</ul> +</td> +</tr> +<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">Value of the specified item key, or an array of all flashdata</p> +</td> +</tr> +<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">mixed</p> +</td> +</tr> +</tbody> +</table> +<p>Gets the value for a specific <code class="docutils literal"><span class="pre">$_SESSION</span></code> item that has +been marked as “flashdata”, or an array of all “flashdata” +items if no key was specified.</p> +<div class="admonition note"> +<p class="first admonition-title">Note</p> +<p class="last">This is a legacy method kept only for backwards +compatibility with older applications. You should +directly access <code class="docutils literal"><span class="pre">$_SESSION</span></code> instead.</p> +</div> +</dd></dl> + +<dl class="method"> +<dt id="CI_Session::keep_flashdata"> +<code class="descname">keep_flashdata</code><span class="sig-paren">(</span><em>$key</em><span class="sig-paren">)</span><a class="headerlink" href="#CI_Session::keep_flashdata" title="Permalink to this definition">¶</a></dt> +<dd><table class="docutils field-list" frame="void" rules="none"> +<col class="field-name" /> +<col class="field-body" /> +<tbody valign="top"> +<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple"> +<li><strong>$key</strong> (<em>mixed</em>) – Flashdata key to keep, or an array of multiple keys</li> +</ul> +</td> +</tr> +<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">TRUE on success, FALSE on failure</p> +</td> +</tr> +<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">bool</p> +</td> +</tr> +</tbody> +</table> +<p>Retains the specified session data key(s) as “flashdata” +through the next request.</p> +<div class="admonition note"> +<p class="first admonition-title">Note</p> +<p class="last">This is a legacy method kept only for backwards +compatibility with older applications. It is just +an alias for the <code class="docutils literal"><span class="pre">mark_as_flash()</span></code> method.</p> +</div> +</dd></dl> + +<dl class="method"> +<dt id="CI_Session::set_flashdata"> +<code class="descname">set_flashdata</code><span class="sig-paren">(</span><em>$data</em><span class="optional">[</span>, <em>$value = NULL</em><span class="optional">]</span><span class="sig-paren">)</span><a class="headerlink" href="#CI_Session::set_flashdata" title="Permalink to this definition">¶</a></dt> +<dd><table class="docutils field-list" frame="void" rules="none"> +<col class="field-name" /> +<col class="field-body" /> +<tbody valign="top"> +<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple"> +<li><strong>$data</strong> (<em>mixed</em>) – An array of key/value pairs to set as flashdata, or the key for a single item</li> +<li><strong>$value</strong> (<em>mixed</em>) – The value to set for a specific session item, if $data is a key</li> +</ul> +</td> +</tr> +<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">void</p> +</td> +</tr> +</tbody> +</table> +<p>Assigns data to the <code class="docutils literal"><span class="pre">$_SESSION</span></code> superglobal and marks it +as “flashdata”.</p> +<div class="admonition note"> +<p class="first admonition-title">Note</p> +<p class="last">This is a legacy method kept only for backwards +compatibility with older applications.</p> +</div> +</dd></dl> + +<dl class="method"> +<dt id="CI_Session::mark_as_temp"> +<code class="descname">mark_as_temp</code><span class="sig-paren">(</span><em>$key</em><span class="optional">[</span>, <em>$ttl = 300</em><span class="optional">]</span><span class="sig-paren">)</span><a class="headerlink" href="#CI_Session::mark_as_temp" title="Permalink to this definition">¶</a></dt> +<dd><table class="docutils field-list" frame="void" rules="none"> +<col class="field-name" /> +<col class="field-body" /> +<tbody valign="top"> +<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple"> +<li><strong>$key</strong> (<em>mixed</em>) – Key to mark as tempdata, or an array of multiple keys</li> +<li><strong>$ttl</strong> (<em>int</em>) – Time-to-live value for the tempdata, in seconds</li> +</ul> +</td> +</tr> +<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">TRUE on success, FALSE on failure</p> +</td> +</tr> +<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">bool</p> +</td> +</tr> +</tbody> +</table> +<p>Marks a <code class="docutils literal"><span class="pre">$_SESSION</span></code> item key (or multiple ones) as +“tempdata”.</p> +</dd></dl> + +<dl class="method"> +<dt id="CI_Session::get_temp_keys"> +<code class="descname">get_temp_keys</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#CI_Session::get_temp_keys" title="Permalink to this definition">¶</a></dt> +<dd><table class="docutils field-list" frame="void" rules="none"> +<col class="field-name" /> +<col class="field-body" /> +<tbody valign="top"> +<tr class="field-odd field"><th class="field-name">Returns:</th><td class="field-body">Array containing the keys of all “tempdata” items.</td> +</tr> +<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body">array</td> +</tr> +</tbody> +</table> +<p>Gets a list of all <code class="docutils literal"><span class="pre">$_SESSION</span></code> that have been marked as +“tempdata”.</p> +</dd></dl> + +<dl class="method"> +<dt id="CI_Session::unmark_temp"> +<code class="descname">unmark_temp</code><span class="sig-paren">(</span><em>$key</em><span class="sig-paren">)</span><a class="headerlink" href="#CI_Session::unmark_temp" title="Permalink to this definition">¶</a></dt> +<dd><table class="docutils field-list" frame="void" rules="none"> +<col class="field-name" /> +<col class="field-body" /> +<tbody valign="top"> +<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple"> +<li><strong>$key</strong> (<em>mixed</em>) – Key to be un-marked as tempdata, or an array of multiple keys</li> +</ul> +</td> +</tr> +<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">void</p> +</td> +</tr> +</tbody> +</table> +<p>Unmarks a <code class="docutils literal"><span class="pre">$_SESSION</span></code> item key (or multiple ones) as +“tempdata”.</p> +</dd></dl> + +<dl class="method"> +<dt id="CI_Session::tempdata"> +<code class="descname">tempdata</code><span class="sig-paren">(</span><span class="optional">[</span><em>$key = NULL</em><span class="optional">]</span><span class="sig-paren">)</span><a class="headerlink" href="#CI_Session::tempdata" title="Permalink to this definition">¶</a></dt> +<dd><table class="docutils field-list" frame="void" rules="none"> +<col class="field-name" /> +<col class="field-body" /> +<tbody valign="top"> +<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple"> +<li><strong>$key</strong> (<em>mixed</em>) – Tempdata item key or NULL</li> +</ul> +</td> +</tr> +<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">Value of the specified item key, or an array of all tempdata</p> +</td> +</tr> +<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">mixed</p> +</td> +</tr> +</tbody> +</table> +<p>Gets the value for a specific <code class="docutils literal"><span class="pre">$_SESSION</span></code> item that has +been marked as “tempdata”, or an array of all “tempdata” +items if no key was specified.</p> +<div class="admonition note"> +<p class="first admonition-title">Note</p> +<p class="last">This is a legacy method kept only for backwards +compatibility with older applications. You should +directly access <code class="docutils literal"><span class="pre">$_SESSION</span></code> instead.</p> +</div> +</dd></dl> + +<dl class="method"> +<dt id="CI_Session::set_tempdata"> +<code class="descname">set_tempdata</code><span class="sig-paren">(</span><em>$data</em><span class="optional">[</span>, <em>$value = NULL</em><span class="optional">]</span><span class="sig-paren">)</span><a class="headerlink" href="#CI_Session::set_tempdata" title="Permalink to this definition">¶</a></dt> +<dd><table class="docutils field-list" frame="void" rules="none"> +<col class="field-name" /> +<col class="field-body" /> +<tbody valign="top"> +<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple"> +<li><strong>$data</strong> (<em>mixed</em>) – An array of key/value pairs to set as tempdata, or the key for a single item</li> +<li><strong>$value</strong> (<em>mixed</em>) – The value to set for a specific session item, if $data is a key</li> +<li><strong>$ttl</strong> (<em>int</em>) – Time-to-live value for the tempdata item(s), in seconds</li> +</ul> +</td> +</tr> +<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">void</p> +</td> +</tr> +</tbody> +</table> +<p>Assigns data to the <code class="docutils literal"><span class="pre">$_SESSION</span></code> superglobal and marks it +as “tempdata”.</p> +<div class="admonition note"> +<p class="first admonition-title">Note</p> +<p class="last">This is a legacy method kept only for backwards +compatibility with older applications.</p> +</div> +</dd></dl> + +<dl class="method"> +<dt id="CI_Session::sess_regenerate"> +<code class="descname">sess_regenerate</code><span class="sig-paren">(</span><span class="optional">[</span><em>$destroy = FALSE</em><span class="optional">]</span><span class="sig-paren">)</span><a class="headerlink" href="#CI_Session::sess_regenerate" title="Permalink to this definition">¶</a></dt> +<dd><table class="docutils field-list" frame="void" rules="none"> +<col class="field-name" /> +<col class="field-body" /> +<tbody valign="top"> +<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple"> +<li><strong>$destroy</strong> (<em>bool</em>) – Whether to destroy session data</li> +</ul> +</td> +</tr> +<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">void</p> +</td> +</tr> +</tbody> +</table> +<p>Regenerate session ID, optionally destroying the current +session’s data.</p> +<div class="admonition note"> +<p class="first admonition-title">Note</p> +<p class="last">This method is just an alias for PHP’s native +<a class="reference external" href="http://php.net/session_regenerate_id">session_regenerate_id()</a> function.</p> +</div> +</dd></dl> + +<dl class="method"> +<dt id="CI_Session::sess_destroy"> +<code class="descname">sess_destroy</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#CI_Session::sess_destroy" title="Permalink to this definition">¶</a></dt> +<dd><table class="docutils field-list" frame="void" rules="none"> +<col class="field-name" /> +<col class="field-body" /> +<tbody valign="top"> +<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body">void</td> +</tr> +</tbody> +</table> +<p>Destroys the current session.</p> +<div class="admonition note"> +<p class="first admonition-title">Note</p> +<p class="last">This must be the <em>last</em> session-related function +that you call. All session data will be lost after +you do that.</p> +</div> +<div class="admonition note"> +<p class="first admonition-title">Note</p> +<p class="last">This method is just an alias for PHP’s native +<a class="reference external" href="http://php.net/session_destroy">session_destroy()</a> function.</p> +</div> +</dd></dl> + +<dl class="method"> +<dt id="CI_Session::__get"> +<code class="descname">__get</code><span class="sig-paren">(</span><em>$key</em><span class="sig-paren">)</span><a class="headerlink" href="#CI_Session::__get" title="Permalink to this definition">¶</a></dt> +<dd><table class="docutils field-list" frame="void" rules="none"> +<col class="field-name" /> +<col class="field-body" /> +<tbody valign="top"> +<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple"> +<li><strong>$key</strong> (<em>string</em>) – Session item key</li> +</ul> +</td> +</tr> +<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">The requested session data item, or NULL if it doesn’t exist</p> +</td> +</tr> +<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">mixed</p> +</td> +</tr> +</tbody> +</table> +<p>A magic method that allows you to use +<code class="docutils literal"><span class="pre">$this->session->item</span></code> instead of <code class="docutils literal"><span class="pre">$_SESSION['item']</span></code>, +if that’s what you prefer.</p> +<p>It will also return the session ID by calling +<code class="docutils literal"><span class="pre">session_id()</span></code> if you try to access +<code class="docutils literal"><span class="pre">$this->session->session_id</span></code>.</p> +</dd></dl> + +<dl class="method"> +<dt id="CI_Session::__set"> +<code class="descname">__set</code><span class="sig-paren">(</span><em>$key</em>, <em>$value</em><span class="sig-paren">)</span><a class="headerlink" href="#CI_Session::__set" title="Permalink to this definition">¶</a></dt> +<dd><table class="docutils field-list" frame="void" rules="none"> +<col class="field-name" /> +<col class="field-body" /> +<tbody valign="top"> +<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple"> +<li><strong>$key</strong> (<em>string</em>) – Session item key</li> +<li><strong>$value</strong> (<em>mixed</em>) – Value to assign to the session item key</li> +</ul> +</td> +</tr> +<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first last">void</p> +</td> +</tr> +</tbody> +</table> +<p>A magic method that allows you to assign items to +<code class="docutils literal"><span class="pre">$_SESSION</span></code> by accessing them as <code class="docutils literal"><span class="pre">$this->session</span></code> +properties:</p> +<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-></span><span class="na">session</span><span class="o">-></span><span class="na">foo</span> <span class="o">=</span> <span class="s1">'bar'</span><span class="p">;</span> + +<span class="c1">// Results in:</span> +<span class="c1">// $_SESSION['foo'] = 'bar';</span> +</pre></div> +</div> +</dd></dl> + +</dd></dl> + +</div> +</div> + + + </div> + <footer> + + <div class="rst-footer-buttons" role="navigation" aria-label="footer navigation"> + + <a href="table.html" class="btn btn-neutral float-right" title="HTML Table Class">Next <span class="fa fa-arrow-circle-right"></span></a> + + + <a href="security.html" class="btn btn-neutral" title="Security Class"><span class="fa fa-arrow-circle-left"></span> Previous</a> + + </div> + + + <hr/> + + <div role="contentinfo"> + <p> + © Copyright 2014 - 2018, British Columbia Institute of Technology. + Last updated on Jan 13, 2018. + </p> + </div> + + Built with <a href="http://sphinx-doc.org/">Sphinx</a> using a <a href="https://github.com/snide/sphinx_rtd_theme">theme</a> provided by <a href="https://readthedocs.org">Read the Docs</a>. + +</footer> + </div> + </div> + + </section> + + </div> + + + + + + <script type="text/javascript"> + var DOCUMENTATION_OPTIONS = { + URL_ROOT:'../', + VERSION:'3.1.7', + COLLAPSE_INDEX:false, + FILE_SUFFIX:'.html', + HAS_SOURCE: false + }; + </script> + <script type="text/javascript" src="../_static/jquery.js"></script> + <script type="text/javascript" src="../_static/underscore.js"></script> + <script type="text/javascript" src="../_static/doctools.js"></script> + + + + + + <script type="text/javascript" src="../_static/js/theme.js"></script> + + + + + <script type="text/javascript"> + jQuery(function () { + SphinxRtdTheme.StickyNav.enable(); + }); + </script> + + +</body> +</html>
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