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diff --git a/user_guide/libraries/caching.html b/user_guide/libraries/caching.html new file mode 100644 index 000000000..03c15c0a6 --- /dev/null +++ b/user_guide/libraries/caching.html @@ -0,0 +1,895 @@ + + +<!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>Caching Driver — CodeIgniter 3.1.8 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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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 current"><a class="current reference internal" href="#">Caching Driver</a></li> +<li class="toctree-l2"><a class="reference internal" href="calendar.html">Calendaring Class</a></li> +<li class="toctree-l2"><a class="reference internal" href="cart.html">Shopping Cart Class</a></li> +<li class="toctree-l2"><a class="reference internal" href="config.html">Config Class</a></li> +<li class="toctree-l2"><a class="reference internal" href="email.html">Email Class</a></li> +<li class="toctree-l2"><a class="reference internal" href="encrypt.html">Encrypt Class</a></li> +<li class="toctree-l2"><a class="reference internal" href="encryption.html">Encryption Library</a></li> +<li class="toctree-l2"><a class="reference internal" href="file_uploading.html">File Uploading Class</a></li> +<li class="toctree-l2"><a class="reference internal" href="form_validation.html">Form Validation</a></li> +<li class="toctree-l2"><a class="reference internal" href="ftp.html">FTP Class</a></li> +<li class="toctree-l2"><a class="reference internal" href="image_lib.html">Image Manipulation Class</a></li> +<li class="toctree-l2"><a class="reference internal" href="input.html">Input Class</a></li> +<li class="toctree-l2"><a class="reference internal" href="javascript.html">Javascript Class</a></li> +<li class="toctree-l2"><a class="reference internal" href="language.html">Language Class</a></li> +<li class="toctree-l2"><a class="reference internal" href="loader.html">Loader Class</a></li> +<li class="toctree-l2"><a class="reference internal" href="migration.html">Migrations Class</a></li> +<li class="toctree-l2"><a class="reference internal" href="output.html">Output Class</a></li> +<li class="toctree-l2"><a class="reference internal" href="pagination.html">Pagination Class</a></li> +<li class="toctree-l2"><a class="reference internal" href="parser.html">Template Parser Class</a></li> +<li class="toctree-l2"><a class="reference internal" href="security.html">Security Class</a></li> +<li class="toctree-l2"><a class="reference internal" href="sessions.html">Session Library</a></li> +<li class="toctree-l2"><a class="reference internal" href="table.html">HTML Table Class</a></li> +<li 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 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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>Caching Driver</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="caching-driver"> +<h1>Caching Driver<a class="headerlink" href="#caching-driver" title="Permalink to this headline">¶</a></h1> +<p>CodeIgniter features wrappers around some of the most popular forms of +fast and dynamic caching. All but file-based caching require specific +server requirements, and a Fatal Exception will be thrown if server +requirements are not met.</p> +<div class="contents local topic" id="contents"> +<ul class="simple"> +<li><a class="reference internal" href="#example-usage" id="id1">Example Usage</a></li> +<li><a class="reference internal" href="#class-reference" id="id2">Class Reference</a></li> +<li><a class="reference internal" href="#drivers" id="id3">Drivers</a><ul> +<li><a class="reference internal" href="#alternative-php-cache-apc-caching" id="id4">Alternative PHP Cache (APC) Caching</a></li> +<li><a class="reference internal" href="#file-based-caching" id="id5">File-based Caching</a></li> +<li><a class="reference internal" href="#memcached-caching" id="id6">Memcached Caching</a></li> +<li><a class="reference internal" href="#wincache-caching" id="id7">WinCache Caching</a></li> +<li><a class="reference internal" href="#redis-caching" id="id8">Redis Caching</a></li> +<li><a class="reference internal" href="#dummy-cache" id="id9">Dummy Cache</a></li> +</ul> +</li> +</ul> +</div> +<div class="custom-index container"></div><div class="section" id="example-usage"> +<h2><a class="toc-backref" href="#id1">Example Usage</a><a class="headerlink" href="#example-usage" title="Permalink to this headline">¶</a></h2> +<p>The following example will load the cache driver, specify <a class="reference external" href="#alternative-php-cache-apc-caching">APC</a> +as the driver to use, and fall back to file-based caching if APC is not +available in the hosting environment.</p> +<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-></span><span class="na">load</span><span class="o">-></span><span class="na">driver</span><span class="p">(</span><span class="s1">'cache'</span><span class="p">,</span> <span class="k">array</span><span class="p">(</span><span class="s1">'adapter'</span> <span class="o">=></span> <span class="s1">'apc'</span><span class="p">,</span> <span class="s1">'backup'</span> <span class="o">=></span> <span class="s1">'file'</span><span class="p">));</span> + +<span class="k">if</span> <span class="p">(</span> <span class="o">!</span> <span class="nv">$foo</span> <span class="o">=</span> <span class="nv">$this</span><span class="o">-></span><span class="na">cache</span><span class="o">-></span><span class="na">get</span><span class="p">(</span><span class="s1">'foo'</span><span class="p">))</span> +<span class="p">{</span> + <span class="k">echo</span> <span class="s1">'Saving to the cache!<br />'</span><span class="p">;</span> + <span class="nv">$foo</span> <span class="o">=</span> <span class="s1">'foobarbaz!'</span><span class="p">;</span> + + <span class="c1">// Save into the cache for 5 minutes</span> + <span class="nv">$this</span><span class="o">-></span><span class="na">cache</span><span class="o">-></span><span class="na">save</span><span class="p">(</span><span class="s1">'foo'</span><span class="p">,</span> <span class="nv">$foo</span><span class="p">,</span> <span class="mi">300</span><span class="p">);</span> +<span class="p">}</span> + +<span class="k">echo</span> <span class="nv">$foo</span><span class="p">;</span> +</pre></div> +</div> +<p>You can also prefix cache item names via the <strong>key_prefix</strong> setting, which is useful +to avoid collisions when you’re running multiple applications on the same environment.</p> +<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-></span><span class="na">load</span><span class="o">-></span><span class="na">driver</span><span class="p">(</span><span class="s1">'cache'</span><span class="p">,</span> + <span class="k">array</span><span class="p">(</span><span class="s1">'adapter'</span> <span class="o">=></span> <span class="s1">'apc'</span><span class="p">,</span> <span class="s1">'backup'</span> <span class="o">=></span> <span class="s1">'file'</span><span class="p">,</span> <span class="s1">'key_prefix'</span> <span class="o">=></span> <span class="s1">'my_'</span><span class="p">)</span> +<span class="p">);</span> + +<span class="nv">$this</span><span class="o">-></span><span class="na">cache</span><span class="o">-></span><span class="na">get</span><span class="p">(</span><span class="s1">'foo'</span><span class="p">);</span> <span class="c1">// Will get the cache entry named 'my_foo'</span> +</pre></div> +</div> +</div> +<div class="section" id="class-reference"> +<h2><a class="toc-backref" href="#id2">Class Reference</a><a class="headerlink" href="#class-reference" title="Permalink to this headline">¶</a></h2> +<dl class="class"> +<dt id="CI_Cache"> +<em class="property">class </em><code class="descname">CI_Cache</code><a class="headerlink" href="#CI_Cache" title="Permalink to this definition">¶</a></dt> +<dd><dl class="method"> +<dt id="CI_Cache::is_supported"> +<code class="descname">is_supported</code><span class="sig-paren">(</span><em>$driver</em><span class="sig-paren">)</span><a class="headerlink" href="#CI_Cache::is_supported" 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>$driver</strong> (<em>string</em>) – the name of the caching driver</li> +</ul> +</td> +</tr> +<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">TRUE if supported, FALSE if not</p> +</td> +</tr> +<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">bool</p> +</td> +</tr> +</tbody> +</table> +<p>This method is automatically called when accessing drivers via +<code class="docutils literal"><span class="pre">$this->cache->get()</span></code>. However, if the individual drivers are used, +make sure to call this method to ensure the driver is supported in the +hosting environment.</p> +<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="k">if</span> <span class="p">(</span><span class="nv">$this</span><span class="o">-></span><span class="na">cache</span><span class="o">-></span><span class="na">apc</span><span class="o">-></span><span class="na">is_supported</span><span class="p">())</span> +<span class="p">{</span> + <span class="k">if</span> <span class="p">(</span><span class="nv">$data</span> <span class="o">=</span> <span class="nv">$this</span><span class="o">-></span><span class="na">cache</span><span class="o">-></span><span class="na">apc</span><span class="o">-></span><span class="na">get</span><span class="p">(</span><span class="s1">'my_cache'</span><span class="p">))</span> + <span class="p">{</span> + <span class="c1">// do things.</span> + <span class="p">}</span> +<span class="p">}</span> +</pre></div> +</div> +</dd></dl> + +<dl class="method"> +<dt id="CI_Cache::get"> +<code class="descname">get</code><span class="sig-paren">(</span><em>$id</em><span class="sig-paren">)</span><a class="headerlink" href="#CI_Cache::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>$id</strong> (<em>string</em>) – Cache item name</li> +</ul> +</td> +</tr> +<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">Item value or FALSE if not found</p> +</td> +</tr> +<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">mixed</p> +</td> +</tr> +</tbody> +</table> +<p>This method will attempt to fetch an item from the cache store. If the +item does not exist, the method will return FALSE.</p> +<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$foo</span> <span class="o">=</span> <span class="nv">$this</span><span class="o">-></span><span class="na">cache</span><span class="o">-></span><span class="na">get</span><span class="p">(</span><span class="s1">'my_cached_item'</span><span class="p">);</span> +</pre></div> +</div> +</dd></dl> + +<dl class="method"> +<dt id="CI_Cache::save"> +<code class="descname">save</code><span class="sig-paren">(</span><em>$id</em>, <em>$data</em><span class="optional">[</span>, <em>$ttl = 60</em><span class="optional">[</span>, <em>$raw = FALSE</em><span class="optional">]</span><span class="optional">]</span><span class="sig-paren">)</span><a class="headerlink" href="#CI_Cache::save" title="Permalink to this definition">¶</a></dt> +<dd><table class="docutils field-list" frame="void" rules="none"> +<col class="field-name" /> +<col class="field-body" /> +<tbody valign="top"> +<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple"> +<li><strong>$id</strong> (<em>string</em>) – Cache item name</li> +<li><strong>$data</strong> (<em>mixed</em>) – the data to save</li> +<li><strong>$ttl</strong> (<em>int</em>) – Time To Live, in seconds (default 60)</li> +<li><strong>$raw</strong> (<em>bool</em>) – Whether to store the raw value</li> +</ul> +</td> +</tr> +<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">TRUE on success, FALSE on failure</p> +</td> +</tr> +<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">string</p> +</td> +</tr> +</tbody> +</table> +<p>This method will save an item to the cache store. If saving fails, the +method will return FALSE.</p> +<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-></span><span class="na">cache</span><span class="o">-></span><span class="na">save</span><span class="p">(</span><span class="s1">'cache_item_id'</span><span class="p">,</span> <span class="s1">'data_to_cache'</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">$raw</span></code> parameter is only utilized by APC and Memcache, +in order to allow usage of <code class="docutils literal"><span class="pre">increment()</span></code> and <code class="docutils literal"><span class="pre">decrement()</span></code>.</p> +</div> +</dd></dl> + +<dl class="method"> +<dt id="CI_Cache::delete"> +<code class="descname">delete</code><span class="sig-paren">(</span><em>$id</em><span class="sig-paren">)</span><a class="headerlink" href="#CI_Cache::delete" 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>$id</strong> (<em>string</em>) – name of cached item</li> +</ul> +</td> +</tr> +<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">TRUE on success, FALSE on failure</p> +</td> +</tr> +<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">bool</p> +</td> +</tr> +</tbody> +</table> +<p>This method will delete a specific item from the cache store. If item +deletion fails, the method will return FALSE.</p> +<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-></span><span class="na">cache</span><span class="o">-></span><span class="na">delete</span><span class="p">(</span><span class="s1">'cache_item_id'</span><span class="p">);</span> +</pre></div> +</div> +</dd></dl> + +<dl class="method"> +<dt id="CI_Cache::increment"> +<code class="descname">increment</code><span class="sig-paren">(</span><em>$id</em><span class="optional">[</span>, <em>$offset = 1</em><span class="optional">]</span><span class="sig-paren">)</span><a class="headerlink" href="#CI_Cache::increment" 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>$id</strong> (<em>string</em>) – Cache ID</li> +<li><strong>$offset</strong> (<em>int</em>) – Step/value to add</li> +</ul> +</td> +</tr> +<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">New value 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">mixed</p> +</td> +</tr> +</tbody> +</table> +<p>Performs atomic incrementation of a raw stored value.</p> +<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="c1">// 'iterator' has a value of 2</span> + +<span class="nv">$this</span><span class="o">-></span><span class="na">cache</span><span class="o">-></span><span class="na">increment</span><span class="p">(</span><span class="s1">'iterator'</span><span class="p">);</span> <span class="c1">// 'iterator' is now 3</span> + +<span class="nv">$this</span><span class="o">-></span><span class="na">cache</span><span class="o">-></span><span class="na">increment</span><span class="p">(</span><span class="s1">'iterator'</span><span class="p">,</span> <span class="mi">3</span><span class="p">);</span> <span class="c1">// 'iterator' is now 6</span> +</pre></div> +</div> +</dd></dl> + +<dl class="method"> +<dt id="CI_Cache::decrement"> +<code class="descname">decrement</code><span class="sig-paren">(</span><em>$id</em><span class="optional">[</span>, <em>$offset = 1</em><span class="optional">]</span><span class="sig-paren">)</span><a class="headerlink" href="#CI_Cache::decrement" 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>$id</strong> (<em>string</em>) – Cache ID</li> +<li><strong>$offset</strong> (<em>int</em>) – Step/value to reduce by</li> +</ul> +</td> +</tr> +<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">New value 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">mixed</p> +</td> +</tr> +</tbody> +</table> +<p>Performs atomic decrementation of a raw stored value.</p> +<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="c1">// 'iterator' has a value of 6</span> + +<span class="nv">$this</span><span class="o">-></span><span class="na">cache</span><span class="o">-></span><span class="na">decrement</span><span class="p">(</span><span class="s1">'iterator'</span><span class="p">);</span> <span class="c1">// 'iterator' is now 5</span> + +<span class="nv">$this</span><span class="o">-></span><span class="na">cache</span><span class="o">-></span><span class="na">decrement</span><span class="p">(</span><span class="s1">'iterator'</span><span class="p">,</span> <span class="mi">2</span><span class="p">);</span> <span class="c1">// 'iterator' is now 3</span> +</pre></div> +</div> +</dd></dl> + +<dl class="method"> +<dt id="CI_Cache::clean"> +<code class="descname">clean</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#CI_Cache::clean" 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">TRUE on success, FALSE on failure</td> +</tr> +<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body">bool</td> +</tr> +</tbody> +</table> +<p>This method will ‘clean’ the entire cache. If the deletion of the +cache files fails, the method will return FALSE.</p> +<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-></span><span class="na">cache</span><span class="o">-></span><span class="na">clean</span><span class="p">();</span> +</pre></div> +</div> +</dd></dl> + +<dl class="method"> +<dt id="CI_Cache::cache_info"> +<code class="descname">cache_info</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#CI_Cache::cache_info" title="Permalink to this definition">¶</a></dt> +<dd><table class="docutils field-list" frame="void" rules="none"> +<col class="field-name" /> +<col class="field-body" /> +<tbody valign="top"> +<tr class="field-odd field"><th class="field-name">Returns:</th><td class="field-body">Information on the entire cache database</td> +</tr> +<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body">mixed</td> +</tr> +</tbody> +</table> +<p>This method will return information on the entire cache.</p> +<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nb">var_dump</span><span class="p">(</span><span class="nv">$this</span><span class="o">-></span><span class="na">cache</span><span class="o">-></span><span class="na">cache_info</span><span class="p">());</span> +</pre></div> +</div> +<div class="admonition note"> +<p class="first admonition-title">Note</p> +<p class="last">The information returned and the structure of the data is dependent +on which adapter is being used.</p> +</div> +</dd></dl> + +<dl class="method"> +<dt id="CI_Cache::get_metadata"> +<code class="descname">get_metadata</code><span class="sig-paren">(</span><em>$id</em><span class="sig-paren">)</span><a class="headerlink" href="#CI_Cache::get_metadata" title="Permalink to this definition">¶</a></dt> +<dd><table class="docutils field-list" frame="void" rules="none"> +<col class="field-name" /> +<col class="field-body" /> +<tbody valign="top"> +<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple"> +<li><strong>$id</strong> (<em>string</em>) – Cache item name</li> +</ul> +</td> +</tr> +<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">Metadata for the cached item</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>This method will return detailed information on a specific item in the +cache.</p> +<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nb">var_dump</span><span class="p">(</span><span class="nv">$this</span><span class="o">-></span><span class="na">cache</span><span class="o">-></span><span class="na">get_metadata</span><span class="p">(</span><span class="s1">'my_cached_item'</span><span class="p">));</span> +</pre></div> +</div> +<div class="admonition note"> +<p class="first admonition-title">Note</p> +<p class="last">The information returned and the structure of the data is dependent +on which adapter is being used.</p> +</div> +</dd></dl> + +</dd></dl> + +</div> +<div class="section" id="drivers"> +<h2><a class="toc-backref" href="#id3">Drivers</a><a class="headerlink" href="#drivers" title="Permalink to this headline">¶</a></h2> +<div class="section" id="alternative-php-cache-apc-caching"> +<h3><a class="toc-backref" href="#id4">Alternative PHP Cache (APC) Caching</a><a class="headerlink" href="#alternative-php-cache-apc-caching" title="Permalink to this headline">¶</a></h3> +<p>All of the methods listed above can be accessed without passing a +specific adapter to the driver loader as follows:</p> +<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-></span><span class="na">load</span><span class="o">-></span><span class="na">driver</span><span class="p">(</span><span class="s1">'cache'</span><span class="p">);</span> +<span class="nv">$this</span><span class="o">-></span><span class="na">cache</span><span class="o">-></span><span class="na">apc</span><span class="o">-></span><span class="na">save</span><span class="p">(</span><span class="s1">'foo'</span><span class="p">,</span> <span class="s1">'bar'</span><span class="p">,</span> <span class="mi">10</span><span class="p">);</span> +</pre></div> +</div> +<p>For more information on APC, please see +<a class="reference external" href="http://php.net/apc">http://php.net/apc</a>.</p> +</div> +<div class="section" id="file-based-caching"> +<h3><a class="toc-backref" href="#id5">File-based Caching</a><a class="headerlink" href="#file-based-caching" title="Permalink to this headline">¶</a></h3> +<p>Unlike caching from the Output Class, the driver file-based caching +allows for pieces of view files to be cached. Use this with care, and +make sure to benchmark your application, as a point can come where disk +I/O will negate positive gains by caching.</p> +<p>All of the methods listed above can be accessed without passing a +specific adapter to the driver loader as follows:</p> +<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-></span><span class="na">load</span><span class="o">-></span><span class="na">driver</span><span class="p">(</span><span class="s1">'cache'</span><span class="p">);</span> +<span class="nv">$this</span><span class="o">-></span><span class="na">cache</span><span class="o">-></span><span class="na">file</span><span class="o">-></span><span class="na">save</span><span class="p">(</span><span class="s1">'foo'</span><span class="p">,</span> <span class="s1">'bar'</span><span class="p">,</span> <span class="mi">10</span><span class="p">);</span> +</pre></div> +</div> +</div> +<div class="section" id="memcached-caching"> +<h3><a class="toc-backref" href="#id6">Memcached Caching</a><a class="headerlink" href="#memcached-caching" title="Permalink to this headline">¶</a></h3> +<p>Multiple Memcached servers can be specified in the memcached.php +configuration file, located in the _application/config/* directory.</p> +<p>All of the methods listed above can be accessed without passing a +specific adapter to the driver loader as follows:</p> +<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-></span><span class="na">load</span><span class="o">-></span><span class="na">driver</span><span class="p">(</span><span class="s1">'cache'</span><span class="p">);</span> +<span class="nv">$this</span><span class="o">-></span><span class="na">cache</span><span class="o">-></span><span class="na">memcached</span><span class="o">-></span><span class="na">save</span><span class="p">(</span><span class="s1">'foo'</span><span class="p">,</span> <span class="s1">'bar'</span><span class="p">,</span> <span class="mi">10</span><span class="p">);</span> +</pre></div> +</div> +<p>For more information on Memcached, please see +<a class="reference external" href="http://php.net/memcached">http://php.net/memcached</a>.</p> +</div> +<div class="section" id="wincache-caching"> +<h3><a class="toc-backref" href="#id7">WinCache Caching</a><a class="headerlink" href="#wincache-caching" title="Permalink to this headline">¶</a></h3> +<p>Under Windows, you can also utilize the WinCache driver.</p> +<p>All of the methods listed above can be accessed without passing a +specific adapter to the driver loader as follows:</p> +<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-></span><span class="na">load</span><span class="o">-></span><span class="na">driver</span><span class="p">(</span><span class="s1">'cache'</span><span class="p">);</span> +<span class="nv">$this</span><span class="o">-></span><span class="na">cache</span><span class="o">-></span><span class="na">wincache</span><span class="o">-></span><span class="na">save</span><span class="p">(</span><span class="s1">'foo'</span><span class="p">,</span> <span class="s1">'bar'</span><span class="p">,</span> <span class="mi">10</span><span class="p">);</span> +</pre></div> +</div> +<p>For more information on WinCache, please see +<a class="reference external" href="http://php.net/wincache">http://php.net/wincache</a>.</p> +</div> +<div class="section" id="redis-caching"> +<h3><a class="toc-backref" href="#id8">Redis Caching</a><a class="headerlink" href="#redis-caching" title="Permalink to this headline">¶</a></h3> +<p>Redis is an in-memory key-value store which can operate in LRU cache mode. +To use it, you need <a class="reference external" href="https://github.com/phpredis/phpredis">Redis server and phpredis PHP extension</a>.</p> +<p>Config options to connect to redis server must be stored in the application/config/redis.php file. +Available options are:</p> +<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$config</span><span class="p">[</span><span class="s1">'socket_type'</span><span class="p">]</span> <span class="o">=</span> <span class="s1">'tcp'</span><span class="p">;</span> <span class="c1">//`tcp` or `unix`</span> +<span class="nv">$config</span><span class="p">[</span><span class="s1">'socket'</span><span class="p">]</span> <span class="o">=</span> <span class="s1">'/var/run/redis.sock'</span><span class="p">;</span> <span class="c1">// in case of `unix` socket type</span> +<span class="nv">$config</span><span class="p">[</span><span class="s1">'host'</span><span class="p">]</span> <span class="o">=</span> <span class="s1">'127.0.0.1'</span><span class="p">;</span> +<span class="nv">$config</span><span class="p">[</span><span class="s1">'password'</span><span class="p">]</span> <span class="o">=</span> <span class="k">NULL</span><span class="p">;</span> +<span class="nv">$config</span><span class="p">[</span><span class="s1">'port'</span><span class="p">]</span> <span class="o">=</span> <span class="mi">6379</span><span class="p">;</span> +<span class="nv">$config</span><span class="p">[</span><span class="s1">'timeout'</span><span class="p">]</span> <span class="o">=</span> <span class="mi">0</span><span class="p">;</span> +</pre></div> +</div> +<p>All of the methods listed above can be accessed without passing a +specific adapter to the driver loader as follows:</p> +<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-></span><span class="na">load</span><span class="o">-></span><span class="na">driver</span><span class="p">(</span><span class="s1">'cache'</span><span class="p">);</span> +<span class="nv">$this</span><span class="o">-></span><span class="na">cache</span><span class="o">-></span><span class="na">redis</span><span class="o">-></span><span class="na">save</span><span class="p">(</span><span class="s1">'foo'</span><span class="p">,</span> <span class="s1">'bar'</span><span class="p">,</span> <span class="mi">10</span><span class="p">);</span> +</pre></div> +</div> +<p>For more information on Redis, please see +<a class="reference external" href="http://redis.io">http://redis.io</a>.</p> +</div> +<div class="section" id="dummy-cache"> +<h3><a class="toc-backref" href="#id9">Dummy Cache</a><a class="headerlink" href="#dummy-cache" title="Permalink to this headline">¶</a></h3> +<p>This is a caching backend that will always ‘miss.’ It stores no data, +but lets you keep your caching code in place in environments that don’t +support your chosen cache.</p> +</div> +</div> +</div> + + + </div> + <footer> + + <div class="rst-footer-buttons" role="navigation" aria-label="footer navigation"> + + <a href="calendar.html" class="btn btn-neutral float-right" title="Calendaring Class">Next <span class="fa fa-arrow-circle-right"></span></a> + + + <a href="benchmark.html" class="btn btn-neutral" title="Benchmarking 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 Mar 22, 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:'3.1.8', + 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 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