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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/general/creating_libraries.html | |
| parent | f0b9735d5857e6c07c8f5824b13cff4828db3cfe (diff) | |
[ci skip] 3.1.7 release
Diffstat (limited to 'user_guide/general/creating_libraries.html')
| -rw-r--r-- | user_guide/general/creating_libraries.html | 754 |
1 files changed, 754 insertions, 0 deletions
diff --git a/user_guide/general/creating_libraries.html b/user_guide/general/creating_libraries.html new file mode 100644 index 000000000..c9220f964 --- /dev/null +++ b/user_guide/general/creating_libraries.html @@ -0,0 +1,754 @@ + + +<!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>Creating Libraries — 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 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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 class="current"> +<li class="toctree-l1 current"><a class="reference internal" href="index.html">General Topics</a><ul class="current"> +<li class="toctree-l2"><a class="reference internal" href="urls.html">CodeIgniter URLs</a></li> +<li class="toctree-l2"><a class="reference internal" href="controllers.html">Controllers</a></li> +<li class="toctree-l2"><a class="reference internal" href="reserved_names.html">Reserved Names</a></li> +<li class="toctree-l2"><a class="reference internal" href="views.html">Views</a></li> +<li class="toctree-l2"><a class="reference internal" href="models.html">Models</a></li> +<li class="toctree-l2"><a class="reference internal" href="helpers.html">Helpers</a></li> +<li class="toctree-l2"><a class="reference internal" href="libraries.html">Using CodeIgniter Libraries</a></li> +<li class="toctree-l2 current"><a class="current reference internal" href="#">Creating Libraries</a></li> +<li class="toctree-l2"><a class="reference internal" href="drivers.html">Using CodeIgniter Drivers</a></li> +<li class="toctree-l2"><a class="reference internal" href="creating_drivers.html">Creating Drivers</a></li> +<li class="toctree-l2"><a class="reference internal" href="core_classes.html">Creating Core System Classes</a></li> +<li class="toctree-l2"><a class="reference internal" href="ancillary_classes.html">Creating Ancillary Classes</a></li> +<li class="toctree-l2"><a class="reference internal" href="hooks.html">Hooks - Extending the Framework Core</a></li> +<li class="toctree-l2"><a class="reference internal" href="autoloader.html">Auto-loading Resources</a></li> +<li class="toctree-l2"><a class="reference internal" href="common_functions.html">Common Functions</a></li> +<li class="toctree-l2"><a class="reference internal" href="compatibility_functions.html">Compatibility Functions</a></li> +<li class="toctree-l2"><a class="reference internal" href="routing.html">URI Routing</a></li> +<li class="toctree-l2"><a class="reference internal" href="errors.html">Error Handling</a></li> +<li class="toctree-l2"><a class="reference internal" href="caching.html">Caching</a></li> +<li class="toctree-l2"><a class="reference internal" href="profiling.html">Profiling Your Application</a></li> +<li class="toctree-l2"><a class="reference internal" href="cli.html">Running via the CLI</a></li> +<li class="toctree-l2"><a class="reference internal" href="managing_apps.html">Managing your Applications</a></li> +<li class="toctree-l2"><a class="reference internal" href="environments.html">Handling Multiple Environments</a></li> +<li class="toctree-l2"><a class="reference internal" href="alternative_php.html">Alternate PHP Syntax for View Files</a></li> +<li class="toctree-l2"><a class="reference internal" href="security.html">Security</a></li> +<li class="toctree-l2"><a class="reference internal" href="styleguide.html">PHP Style Guide</a></li> +</ul> +</li> +</ul> +<ul> +<li class="toctree-l1"><a class="reference internal" href="../libraries/index.html">Libraries</a><ul> +<li class="toctree-l2"><a class="reference internal" href="../libraries/benchmark.html">Benchmarking Class</a></li> +<li class="toctree-l2"><a class="reference internal" href="../libraries/caching.html">Caching Driver</a></li> +<li class="toctree-l2"><a class="reference internal" href="../libraries/calendar.html">Calendaring Class</a></li> +<li class="toctree-l2"><a class="reference internal" href="../libraries/cart.html">Shopping Cart Class</a></li> +<li class="toctree-l2"><a class="reference internal" href="../libraries/config.html">Config Class</a></li> +<li class="toctree-l2"><a class="reference internal" href="../libraries/email.html">Email Class</a></li> +<li class="toctree-l2"><a class="reference internal" href="../libraries/encrypt.html">Encrypt Class</a></li> +<li class="toctree-l2"><a class="reference internal" href="../libraries/encryption.html">Encryption Library</a></li> +<li class="toctree-l2"><a class="reference internal" href="../libraries/file_uploading.html">File Uploading Class</a></li> +<li class="toctree-l2"><a class="reference internal" href="../libraries/form_validation.html">Form Validation</a></li> +<li class="toctree-l2"><a class="reference internal" href="../libraries/ftp.html">FTP Class</a></li> +<li class="toctree-l2"><a class="reference internal" href="../libraries/image_lib.html">Image Manipulation Class</a></li> +<li class="toctree-l2"><a class="reference internal" href="../libraries/input.html">Input Class</a></li> +<li class="toctree-l2"><a class="reference internal" href="../libraries/javascript.html">Javascript Class</a></li> +<li class="toctree-l2"><a class="reference internal" href="../libraries/language.html">Language Class</a></li> +<li class="toctree-l2"><a class="reference internal" href="../libraries/loader.html">Loader Class</a></li> +<li class="toctree-l2"><a class="reference internal" href="../libraries/migration.html">Migrations Class</a></li> +<li class="toctree-l2"><a class="reference internal" href="../libraries/output.html">Output Class</a></li> +<li class="toctree-l2"><a class="reference internal" href="../libraries/pagination.html">Pagination Class</a></li> +<li class="toctree-l2"><a class="reference internal" href="../libraries/parser.html">Template Parser Class</a></li> +<li class="toctree-l2"><a class="reference internal" href="../libraries/security.html">Security Class</a></li> +<li class="toctree-l2"><a class="reference internal" href="../libraries/sessions.html">Session Library</a></li> +<li class="toctree-l2"><a class="reference internal" href="../libraries/table.html">HTML Table Class</a></li> +<li class="toctree-l2"><a class="reference internal" href="../libraries/trackback.html">Trackback Class</a></li> +<li class="toctree-l2"><a class="reference internal" href="../libraries/typography.html">Typography Class</a></li> +<li class="toctree-l2"><a class="reference internal" href="../libraries/unit_testing.html">Unit Testing Class</a></li> +<li class="toctree-l2"><a class="reference internal" href="../libraries/uri.html">URI Class</a></li> +<li class="toctree-l2"><a class="reference internal" href="../libraries/user_agent.html">User Agent Class</a></li> +<li class="toctree-l2"><a class="reference internal" href="../libraries/xmlrpc.html">XML-RPC and XML-RPC Server Classes</a></li> +<li class="toctree-l2"><a class="reference internal" href="../libraries/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">General Topics</a> »</li> + + <li>Creating Libraries</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="creating-libraries"> +<h1>Creating Libraries<a class="headerlink" href="#creating-libraries" title="Permalink to this headline">¶</a></h1> +<p>When we use the term “Libraries” we are normally referring to the +classes that are located in the libraries directory and described in the +Class Reference of this user guide. In this case, however, we will +instead describe how you can create your own libraries within your +application/libraries directory in order to maintain separation between +your local resources and the global framework resources.</p> +<p>As an added bonus, CodeIgniter permits your libraries to extend native +classes if you simply need to add some functionality to an existing +library. Or you can even replace native libraries just by placing +identically named versions in your <em>application/libraries</em> directory.</p> +<p>In summary:</p> +<ul class="simple"> +<li>You can create entirely new libraries.</li> +<li>You can extend native libraries.</li> +<li>You can replace native libraries.</li> +</ul> +<p>The page below explains these three concepts in detail.</p> +<div class="admonition note"> +<p class="first admonition-title">Note</p> +<p class="last">The Database classes can not be extended or replaced with your +own classes. All other classes are able to be replaced/extended.</p> +</div> +<div class="section" id="storage"> +<h2>Storage<a class="headerlink" href="#storage" title="Permalink to this headline">¶</a></h2> +<p>Your library classes should be placed within your <em>application/libraries</em> +directory, as this is where CodeIgniter will look for them when they are +initialized.</p> +</div> +<div class="section" id="naming-conventions"> +<h2>Naming Conventions<a class="headerlink" href="#naming-conventions" title="Permalink to this headline">¶</a></h2> +<ul class="simple"> +<li>File names must be capitalized. For example: Myclass.php</li> +<li>Class declarations must be capitalized. For example: class Myclass</li> +<li>Class names and file names must match.</li> +</ul> +</div> +<div class="section" id="the-class-file"> +<h2>The Class File<a class="headerlink" href="#the-class-file" title="Permalink to this headline">¶</a></h2> +<p>Classes should have this basic prototype:</p> +<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="o"><?</span><span class="nx">php</span> +<span class="nb">defined</span><span class="p">(</span><span class="s1">'BASEPATH'</span><span class="p">)</span> <span class="k">OR</span> <span class="k">exit</span><span class="p">(</span><span class="s1">'No direct script access allowed'</span><span class="p">);</span> + +<span class="k">class</span> <span class="nc">Someclass</span> <span class="p">{</span> + + <span class="k">public</span> <span class="k">function</span> <span class="nf">some_method</span><span class="p">()</span> + <span class="p">{</span> + <span class="p">}</span> +<span class="p">}</span> +</pre></div> +</div> +<div class="admonition note"> +<p class="first admonition-title">Note</p> +<p class="last">We are using the name Someclass purely as an example.</p> +</div> +</div> +<div class="section" id="using-your-class"> +<h2>Using Your Class<a class="headerlink" href="#using-your-class" title="Permalink to this headline">¶</a></h2> +<p>From within any of your <a class="reference internal" href="controllers.html"><span class="doc">Controller</span></a> methods you +can initialize your class using the standard:</p> +<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-></span><span class="na">load</span><span class="o">-></span><span class="na">library</span><span class="p">(</span><span class="s1">'someclass'</span><span class="p">);</span> +</pre></div> +</div> +<p>Where <em>someclass</em> is the file name, without the “.php” file extension. +You can submit the file name capitalized or lower case. CodeIgniter +doesn’t care.</p> +<p>Once loaded you can access your class using the lower case version:</p> +<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-></span><span class="na">someclass</span><span class="o">-></span><span class="na">some_method</span><span class="p">();</span><span class="nx"> </span> <span class="c1">// Object instances will always be lower case</span> +</pre></div> +</div> +</div> +<div class="section" id="passing-parameters-when-initializing-your-class"> +<h2>Passing Parameters When Initializing Your Class<a class="headerlink" href="#passing-parameters-when-initializing-your-class" title="Permalink to this headline">¶</a></h2> +<p>In the library loading method you can dynamically pass data as an +array via the second parameter and it will be passed to your class +constructor:</p> +<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$params</span> <span class="o">=</span> <span class="k">array</span><span class="p">(</span><span class="s1">'type'</span> <span class="o">=></span> <span class="s1">'large'</span><span class="p">,</span> <span class="s1">'color'</span> <span class="o">=></span> <span class="s1">'red'</span><span class="p">);</span> + +<span class="nv">$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">'someclass'</span><span class="p">,</span> <span class="nv">$params</span><span class="p">);</span> +</pre></div> +</div> +<p>If you use this feature you must set up your class constructor to expect +data:</p> +<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="o"><?</span><span class="nx">php</span> <span class="nb">defined</span><span class="p">(</span><span class="s1">'BASEPATH'</span><span class="p">)</span> <span class="k">OR</span> <span class="k">exit</span><span class="p">(</span><span class="s1">'No direct script access allowed'</span><span class="p">);</span> + +<span class="k">class</span> <span class="nc">Someclass</span> <span class="p">{</span> + + <span class="k">public</span> <span class="k">function</span> <span class="nf">__construct</span><span class="p">(</span><span class="nv">$params</span><span class="p">)</span> + <span class="p">{</span> + <span class="c1">// Do something with $params</span> + <span class="p">}</span> +<span class="p">}</span> +</pre></div> +</div> +<p>You can also pass parameters stored in a config file. Simply create a +config file named identically to the class file name and store it in +your <em>application/config/</em> directory. Note that if you dynamically pass +parameters as described above, the config file option will not be +available.</p> +</div> +<div class="section" id="utilizing-codeigniter-resources-within-your-library"> +<h2>Utilizing CodeIgniter Resources within Your Library<a class="headerlink" href="#utilizing-codeigniter-resources-within-your-library" title="Permalink to this headline">¶</a></h2> +<p>To access CodeIgniter’s native resources within your library use the +<code class="docutils literal"><span class="pre">get_instance()</span></code> method. This method returns the CodeIgniter super +object.</p> +<p>Normally from within your controller methods you will call any of the +available CodeIgniter methods using the <code class="docutils literal"><span class="pre">$this</span></code> construct:</p> +<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-></span><span class="na">load</span><span class="o">-></span><span class="na">helper</span><span class="p">(</span><span class="s1">'url'</span><span class="p">);</span> +<span class="nv">$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> +<span class="nv">$this</span><span class="o">-></span><span class="na">config</span><span class="o">-></span><span class="na">item</span><span class="p">(</span><span class="s1">'base_url'</span><span class="p">);</span> +<span class="c1">// etc.</span> +</pre></div> +</div> +<p><code class="docutils literal"><span class="pre">$this</span></code>, however, only works directly within your controllers, your +models, or your views. If you would like to use CodeIgniter’s classes +from within your own custom classes you can do so as follows:</p> +<p>First, assign the CodeIgniter object to a variable:</p> +<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$CI</span> <span class="o">=&</span> <span class="nx">get_instance</span><span class="p">();</span> +</pre></div> +</div> +<p>Once you’ve assigned the object to a variable, you’ll use that variable +<em>instead</em> of <code class="docutils literal"><span class="pre">$this</span></code>:</p> +<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$CI</span> <span class="o">=&</span> <span class="nx">get_instance</span><span class="p">();</span> + +<span class="nv">$CI</span><span class="o">-></span><span class="na">load</span><span class="o">-></span><span class="na">helper</span><span class="p">(</span><span class="s1">'url'</span><span class="p">);</span> +<span class="nv">$CI</span><span class="o">-></span><span class="na">load</span><span class="o">-></span><span class="na">library</span><span class="p">(</span><span class="s1">'session'</span><span class="p">);</span> +<span class="nv">$CI</span><span class="o">-></span><span class="na">config</span><span class="o">-></span><span class="na">item</span><span class="p">(</span><span class="s1">'base_url'</span><span class="p">);</span> +<span class="c1">// etc.</span> +</pre></div> +</div> +<div class="admonition note"> +<p class="first admonition-title">Note</p> +<p>You’ll notice that the above <code class="docutils literal"><span class="pre">get_instance()</span></code> function is being +passed by reference:</p> +<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$CI</span> <span class="o">=&</span> <span class="nx">get_instance</span><span class="p">();</span> +</pre></div> +</div> +<p class="last">This is very important. Assigning by reference allows you to use the +original CodeIgniter object rather than creating a copy of it.</p> +</div> +<p>However, since a library is a class, it would be better if you +take full advantage of the OOP principles. So, in order to +be able to use the CodeIgniter super-object in all of the class +methods, you’re encouraged to assign it to a property instead:</p> +<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="k">class</span> <span class="nc">Example_library</span> <span class="p">{</span> + + <span class="k">protected</span> <span class="nv">$CI</span><span class="p">;</span> + + <span class="c1">// We'll use a constructor, as you can't directly call a function</span> + <span class="c1">// from a property definition.</span> + <span class="k">public</span> <span class="k">function</span> <span class="nf">__construct</span><span class="p">()</span> + <span class="p">{</span> + <span class="c1">// Assign the CodeIgniter super-object</span> + <span class="nv">$this</span><span class="o">-></span><span class="na">CI</span> <span class="o">=&</span> <span class="nx">get_instance</span><span class="p">();</span> + <span class="p">}</span> + + <span class="k">public</span> <span class="k">function</span> <span class="nf">foo</span><span class="p">()</span> + <span class="p">{</span> + <span class="nv">$this</span><span class="o">-></span><span class="na">CI</span><span class="o">-></span><span class="na">load</span><span class="o">-></span><span class="na">helper</span><span class="p">(</span><span class="s1">'url'</span><span class="p">);</span> + <span class="nx">redirect</span><span class="p">();</span> + <span class="p">}</span> + + <span class="k">public</span> <span class="k">function</span> <span class="nf">bar</span><span class="p">()</span> + <span class="p">{</span> + <span class="k">echo</span> <span class="nv">$this</span><span class="o">-></span><span class="na">CI</span><span class="o">-></span><span class="na">config</span><span class="o">-></span><span class="na">item</span><span class="p">(</span><span class="s1">'base_url'</span><span class="p">);</span> + <span class="p">}</span> + +<span class="p">}</span> +</pre></div> +</div> +</div> +<div class="section" id="replacing-native-libraries-with-your-versions"> +<h2>Replacing Native Libraries with Your Versions<a class="headerlink" href="#replacing-native-libraries-with-your-versions" title="Permalink to this headline">¶</a></h2> +<p>Simply by naming your class files identically to a native library will +cause CodeIgniter to use it instead of the native one. To use this +feature you must name the file and the class declaration exactly the +same as the native library. For example, to replace the native Email +library you’ll create a file named <em>application/libraries/Email.php</em>, +and declare your class with:</p> +<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="k">class</span> <span class="nc">CI_Email</span> <span class="p">{</span> + +<span class="p">}</span> +</pre></div> +</div> +<p>Note that most native classes are prefixed with CI_.</p> +<p>To load your library you’ll see the standard loading method:</p> +<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$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">'email'</span><span class="p">);</span> +</pre></div> +</div> +<div class="admonition note"> +<p class="first admonition-title">Note</p> +<p class="last">At this time the Database classes can not be replaced with +your own versions.</p> +</div> +</div> +<div class="section" id="extending-native-libraries"> +<h2>Extending Native Libraries<a class="headerlink" href="#extending-native-libraries" title="Permalink to this headline">¶</a></h2> +<p>If all you need to do is add some functionality to an existing library - +perhaps add a method or two - then it’s overkill to replace the entire +library with your version. In this case it’s better to simply extend the +class. Extending a class is nearly identical to replacing a class with a +couple exceptions:</p> +<ul class="simple"> +<li>The class declaration must extend the parent class.</li> +<li>Your new class name and filename must be prefixed with MY_ (this +item is configurable. See below.).</li> +</ul> +<p>For example, to extend the native Email class you’ll create a file named +<em>application/libraries/MY_Email.php</em>, and declare your class with:</p> +<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="k">class</span> <span class="nc">MY_Email</span> <span class="k">extends</span> <span class="nx">CI_Email</span> <span class="p">{</span> + +<span class="p">}</span> +</pre></div> +</div> +<p>If you need to use a constructor in your class make sure you +extend the parent constructor:</p> +<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="k">class</span> <span class="nc">MY_Email</span> <span class="k">extends</span> <span class="nx">CI_Email</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="nv">$config</span> <span class="o">=</span> <span class="k">array</span><span class="p">())</span> + <span class="p">{</span> + <span class="k">parent</span><span class="o">::</span><span class="na">__construct</span><span class="p">(</span><span class="nv">$config</span><span class="p">);</span> + <span class="c1">// Your own constructor code</span> + <span class="p">}</span> + +<span class="p">}</span> +</pre></div> +</div> +<div class="admonition note"> +<p class="first admonition-title">Note</p> +<p class="last">Not all of the libraries have the same (or any) parameters +in their constructor. Take a look at the library that you’re +extending first to see how it should be implemented.</p> +</div> +<div class="section" id="loading-your-sub-class"> +<h3>Loading Your Sub-class<a class="headerlink" href="#loading-your-sub-class" title="Permalink to this headline">¶</a></h3> +<p>To load your sub-class you’ll use the standard syntax normally used. DO +NOT include your prefix. For example, to load the example above, which +extends the Email class, you will use:</p> +<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-></span><span class="na">load</span><span class="o">-></span><span class="na">library</span><span class="p">(</span><span class="s1">'email'</span><span class="p">);</span> +</pre></div> +</div> +<p>Once loaded you will use the class variable as you normally would for +the class you are extending. In the case of the email class all calls +will use:</p> +<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-></span><span class="na">email</span><span class="o">-></span><span class="na">some_method</span><span class="p">();</span> +</pre></div> +</div> +</div> +<div class="section" id="setting-your-own-prefix"> +<h3>Setting Your Own Prefix<a class="headerlink" href="#setting-your-own-prefix" title="Permalink to this headline">¶</a></h3> +<p>To set your own sub-class prefix, open your +<em>application/config/config.php</em> file and look for this item:</p> +<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$config</span><span class="p">[</span><span class="s1">'subclass_prefix'</span><span class="p">]</span> <span class="o">=</span> <span class="s1">'MY_'</span><span class="p">;</span> +</pre></div> +</div> +<p>Please note that all native CodeIgniter libraries are prefixed with CI_ +so DO NOT use that as your prefix.</p> +</div> +</div> +</div> + + + </div> + <footer> + + <div class="rst-footer-buttons" role="navigation" aria-label="footer navigation"> + + <a href="drivers.html" class="btn btn-neutral float-right" title="Using CodeIgniter Drivers">Next <span class="fa fa-arrow-circle-right"></span></a> + + + <a href="libraries.html" class="btn btn-neutral" title="Using CodeIgniter Libraries"><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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