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<!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>Loader Class &mdash; CodeIgniter 3.1.11 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" />
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href="../genindex.html"/>
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<link rel="top" title="CodeIgniter 3.1.11 documentation" href="../index.html"/>
<link rel="up" title="Libraries" href="index.html"/>
<link rel="next" title="Migrations Class" href="migration.html"/>
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<li class="toctree-l2"><a class="reference internal" href="zip.html">Zip Encoding Class</a></li>
</ul>
</li>
</ul>
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<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 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 current"><a class="current reference internal" href="#">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 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>
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<section data-toggle="wy-nav-shift" class="wy-nav-content-wrap">
<nav class="wy-nav-top" role="navigation" aria-label="top navigation">
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<a href="../index.html">CodeIgniter</a>
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<ul class="wy-breadcrumbs">
<li><a href="../index.html">Docs</a> &raquo;</li>
<li><a href="index.html">Libraries</a> &raquo;</li>
<li>Loader Class</li>
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</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==" />
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<div role="main" class="document">
<div class="section" id="loader-class">
<h1>Loader Class<a class="headerlink" href="#loader-class" title="Permalink to this headline"></a></h1>
<p>Loader, as the name suggests, is used to load elements. These elements
can be libraries (classes) <a class="reference internal" href="../general/views.html"><span class="doc">View files</span></a>,
<a class="reference internal" href="../general/drivers.html"><span class="doc">Drivers</span></a>,
<a class="reference internal" href="../general/helpers.html"><span class="doc">Helpers</span></a>,
<a class="reference internal" href="../general/models.html"><span class="doc">Models</span></a>, or your own files.</p>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last">This class is initialized automatically by the system so there
is no need to do it manually.</p>
</div>
<div class="contents local topic" id="contents">
<ul class="simple">
<li><a class="reference internal" href="#application-packages" id="id2">Application “Packages”</a><ul>
<li><a class="reference internal" href="#package-view-files" id="id3">Package view files</a></li>
</ul>
</li>
<li><a class="reference internal" href="#class-reference" id="id4">Class Reference</a></li>
</ul>
</div>
<div class="custom-index container"></div><div class="section" id="application-packages">
<h2><a class="toc-backref" href="#id2">Application “Packages”</a><a class="headerlink" href="#application-packages" title="Permalink to this headline"></a></h2>
<p>An application package allows for the easy distribution of complete sets
of resources in a single directory, complete with its own libraries,
models, helpers, config, and language files. It is recommended that
these packages be placed in the application/third_party directory. Below
is a sample map of an package directory.</p>
<p>The following is an example of a directory for an application package
named “Foo Bar”.</p>
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="o">/</span><span class="nx">application</span><span class="o">/</span><span class="nx">third_party</span><span class="o">/</span><span class="nx">foo_bar</span>
<span class="nx">config</span><span class="o">/</span>
<span class="nx">helpers</span><span class="o">/</span>
<span class="nx">language</span><span class="o">/</span>
<span class="nx">libraries</span><span class="o">/</span>
<span class="nx">models</span><span class="o">/</span>
</pre></div>
</div>
<p>Whatever the purpose of the “Foo Bar” application package, it has its
own config files, helpers, language files, libraries, and models. To use
these resources in your controllers, you first need to tell the Loader
that you are going to be loading resources from a package, by adding the
package path via the <code class="docutils literal"><span class="pre">add_package_path()</span></code> method.</p>
<div class="section" id="package-view-files">
<h3><a class="toc-backref" href="#id3">Package view files</a><a class="headerlink" href="#package-view-files" title="Permalink to this headline"></a></h3>
<p>By Default, package view files paths are set when <code class="docutils literal"><span class="pre">add_package_path()</span></code>
is called. View paths are looped through, and once a match is
encountered that view is loaded.</p>
<p>In this instance, it is possible for view naming collisions within
packages to occur, and possibly the incorrect package being loaded. To
ensure against this, set an optional second parameter of FALSE when
calling <code class="docutils literal"><span class="pre">add_package_path()</span></code>.</p>
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">load</span><span class="o">-&gt;</span><span class="na">add_package_path</span><span class="p">(</span><span class="nx">APPPATH</span><span class="o">.</span><span class="s1">&#39;my_app&#39;</span><span class="p">,</span> <span class="k">FALSE</span><span class="p">);</span>
<span class="nv">$this</span><span class="o">-&gt;</span><span class="na">load</span><span class="o">-&gt;</span><span class="na">view</span><span class="p">(</span><span class="s1">&#39;my_app_index&#39;</span><span class="p">);</span> <span class="c1">// Loads</span>
<span class="nv">$this</span><span class="o">-&gt;</span><span class="na">load</span><span class="o">-&gt;</span><span class="na">view</span><span class="p">(</span><span class="s1">&#39;welcome_message&#39;</span><span class="p">);</span> <span class="c1">// Will not load the default welcome_message b/c the second param to add_package_path is FALSE</span>
<span class="c1">// Reset things</span>
<span class="nv">$this</span><span class="o">-&gt;</span><span class="na">load</span><span class="o">-&gt;</span><span class="na">remove_package_path</span><span class="p">(</span><span class="nx">APPPATH</span><span class="o">.</span><span class="s1">&#39;my_app&#39;</span><span class="p">);</span>
<span class="c1">// Again without the second parameter:</span>
<span class="nv">$this</span><span class="o">-&gt;</span><span class="na">load</span><span class="o">-&gt;</span><span class="na">add_package_path</span><span class="p">(</span><span class="nx">APPPATH</span><span class="o">.</span><span class="s1">&#39;my_app&#39;</span><span class="p">);</span>
<span class="nv">$this</span><span class="o">-&gt;</span><span class="na">load</span><span class="o">-&gt;</span><span class="na">view</span><span class="p">(</span><span class="s1">&#39;my_app_index&#39;</span><span class="p">);</span> <span class="c1">// Loads</span>
<span class="nv">$this</span><span class="o">-&gt;</span><span class="na">load</span><span class="o">-&gt;</span><span class="na">view</span><span class="p">(</span><span class="s1">&#39;welcome_message&#39;</span><span class="p">);</span> <span class="c1">// Loads</span>
</pre></div>
</div>
</div>
</div>
<div class="section" id="class-reference">
<h2><a class="toc-backref" href="#id4">Class Reference</a><a class="headerlink" href="#class-reference" title="Permalink to this headline"></a></h2>
<dl class="class">
<dt id="CI_Loader">
<em class="property">class </em><code class="descname">CI_Loader</code><a class="headerlink" href="#CI_Loader" title="Permalink to this definition"></a></dt>
<dd><dl class="method">
<dt id="CI_Loader::library">
<code class="descname">library</code><span class="sig-paren">(</span><em>$library</em><span class="optional">[</span>, <em>$params = NULL</em><span class="optional">[</span>, <em>$object_name = NULL</em><span class="optional">]</span><span class="optional">]</span><span class="sig-paren">)</span><a class="headerlink" href="#CI_Loader::library" 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>$library</strong> (<em>mixed</em>) – Library name as a string or an array with multiple libraries</li>
<li><strong>$params</strong> (<em>array</em>) – Optional array of parameters to pass to the loaded library’s constructor</li>
<li><strong>$object_name</strong> (<em>string</em>) – Optional object name to assign the library to</li>
</ul>
</td>
</tr>
<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">CI_Loader instance (method chaining)</p>
</td>
</tr>
<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">CI_Loader</p>
</td>
</tr>
</tbody>
</table>
<p>This method is used to load core classes.</p>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last">We use the terms “class” and “library” interchangeably.</p>
</div>
<p>For example, if you would like to send email with CodeIgniter, the first
step is to load the email class within your controller:</p>
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">load</span><span class="o">-&gt;</span><span class="na">library</span><span class="p">(</span><span class="s1">&#39;email&#39;</span><span class="p">);</span>
</pre></div>
</div>
<p>Once loaded, the library will be ready for use, using <code class="docutils literal"><span class="pre">$this-&gt;email</span></code>.</p>
<p>Library files can be stored in subdirectories within the main
“libraries” directory, or within your personal <em>application/libraries</em>
directory. To load a file located in a subdirectory, simply include the
path, relative to the “libraries” directory. For example, if you have
file located at:</p>
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nx">libraries</span><span class="o">/</span><span class="nx">flavors</span><span class="o">/</span><span class="nx">Chocolate</span><span class="o">.</span><span class="nx">php</span>
</pre></div>
</div>
<p>You will load it using:</p>
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">load</span><span class="o">-&gt;</span><span class="na">library</span><span class="p">(</span><span class="s1">&#39;flavors/chocolate&#39;</span><span class="p">);</span>
</pre></div>
</div>
<p>You may nest the file in as many subdirectories as you want.</p>
<p>Additionally, multiple libraries can be loaded at the same time by
passing an array of libraries to the load method.</p>
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">load</span><span class="o">-&gt;</span><span class="na">library</span><span class="p">(</span><span class="k">array</span><span class="p">(</span><span class="s1">&#39;email&#39;</span><span class="p">,</span> <span class="s1">&#39;table&#39;</span><span class="p">));</span>
</pre></div>
</div>
<p><strong>Setting options</strong></p>
<p>The second (optional) parameter allows you to optionally pass
configuration setting. You will typically pass these as an array:</p>
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$config</span> <span class="o">=</span> <span class="k">array</span> <span class="p">(</span>
<span class="s1">&#39;mailtype&#39;</span> <span class="o">=&gt;</span> <span class="s1">&#39;html&#39;</span><span class="p">,</span>
<span class="s1">&#39;charset&#39;</span> <span class="o">=&gt;</span> <span class="s1">&#39;utf-8&#39;</span><span class="p">,</span>
<span class="s1">&#39;priority&#39;</span> <span class="o">=&gt;</span> <span class="s1">&#39;1&#39;</span>
<span class="p">);</span>
<span class="nv">$this</span><span class="o">-&gt;</span><span class="na">load</span><span class="o">-&gt;</span><span class="na">library</span><span class="p">(</span><span class="s1">&#39;email&#39;</span><span class="p">,</span> <span class="nv">$config</span><span class="p">);</span>
</pre></div>
</div>
<p>Config options can usually also be set via a config file. Each library
is explained in detail in its own page, so please read the information
regarding each one you would like to use.</p>
<p>Please take note, when multiple libraries are supplied in an array for
the first parameter, each will receive the same parameter information.</p>
<p><strong>Assigning a Library to a different object name</strong></p>
<p>If the third (optional) parameter is blank, the library will usually be
assigned to an object with the same name as the library. For example, if
the library is named Calendar, it will be assigned to a variable named
<code class="docutils literal"><span class="pre">$this-&gt;calendar</span></code>.</p>
<p>If you prefer to set your own class names you can pass its value to the
third parameter:</p>
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">load</span><span class="o">-&gt;</span><span class="na">library</span><span class="p">(</span><span class="s1">&#39;calendar&#39;</span><span class="p">,</span> <span class="k">NULL</span><span class="p">,</span> <span class="s1">&#39;my_calendar&#39;</span><span class="p">);</span>
<span class="c1">// Calendar class is now accessed using:</span>
<span class="nv">$this</span><span class="o">-&gt;</span><span class="na">my_calendar</span>
</pre></div>
</div>
<p>Please take note, when multiple libraries are supplied in an array for
the first parameter, this parameter is discarded.</p>
</dd></dl>
<dl class="method">
<dt id="CI_Loader::driver">
<code class="descname">driver</code><span class="sig-paren">(</span><em>$library</em><span class="optional">[</span>, <em>$params = NULL</em><span class="optional">[</span>, <em>$object_name</em><span class="optional">]</span><span class="optional">]</span><span class="sig-paren">)</span><a class="headerlink" href="#CI_Loader::driver" 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>$library</strong> (<em>mixed</em>) – Library name as a string or an array with multiple libraries</li>
<li><strong>$params</strong> (<em>array</em>) – Optional array of parameters to pass to the loaded library’s constructor</li>
<li><strong>$object_name</strong> (<em>string</em>) – Optional object name to assign the library to</li>
</ul>
</td>
</tr>
<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">CI_Loader instance (method chaining)</p>
</td>
</tr>
<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">CI_Loader</p>
</td>
</tr>
</tbody>
</table>
<p>This method is used to load driver libraries, acts very much like the
<code class="docutils literal"><span class="pre">library()</span></code> method.</p>
<p>As an example, if you would like to use sessions with CodeIgniter, the first
step is to load the session driver within your controller:</p>
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">load</span><span class="o">-&gt;</span><span class="na">driver</span><span class="p">(</span><span class="s1">&#39;session&#39;</span><span class="p">);</span>
</pre></div>
</div>
<p>Once loaded, the library will be ready for use, using <code class="docutils literal"><span class="pre">$this-&gt;session</span></code>.</p>
<p>Driver files must be stored in a subdirectory within the main
“libraries” directory, or within your personal <em>application/libraries</em>
directory. The subdirectory must match the parent class name. Read the
<a class="reference internal" href="../general/drivers.html"><span class="doc">Drivers</span></a> description for details.</p>
<p>Additionally, multiple driver libraries can be loaded at the same time by
passing an array of drivers to the load method.</p>
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">load</span><span class="o">-&gt;</span><span class="na">driver</span><span class="p">(</span><span class="k">array</span><span class="p">(</span><span class="s1">&#39;session&#39;</span><span class="p">,</span> <span class="s1">&#39;cache&#39;</span><span class="p">));</span>
</pre></div>
</div>
<p><strong>Setting options</strong></p>
<p>The second (optional) parameter allows you to optionally pass
configuration settings. You will typically pass these as an array:</p>
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$config</span> <span class="o">=</span> <span class="k">array</span><span class="p">(</span>
<span class="s1">&#39;sess_driver&#39;</span> <span class="o">=&gt;</span> <span class="s1">&#39;cookie&#39;</span><span class="p">,</span>
<span class="s1">&#39;sess_encrypt_cookie&#39;</span> <span class="o">=&gt;</span> <span class="k">true</span><span class="p">,</span>
<span class="s1">&#39;encryption_key&#39;</span> <span class="o">=&gt;</span> <span class="s1">&#39;mysecretkey&#39;</span>
<span class="p">);</span>
<span class="nv">$this</span><span class="o">-&gt;</span><span class="na">load</span><span class="o">-&gt;</span><span class="na">driver</span><span class="p">(</span><span class="s1">&#39;session&#39;</span><span class="p">,</span> <span class="nv">$config</span><span class="p">);</span>
</pre></div>
</div>
<p>Config options can usually also be set via a config file. Each library
is explained in detail in its own page, so please read the information
regarding each one you would like to use.</p>
<p><strong>Assigning a Driver to a different object name</strong></p>
<p>If the third (optional) parameter is blank, the library will be assigned
to an object with the same name as the parent class. For example, if
the library is named Session, it will be assigned to a variable named
<code class="docutils literal"><span class="pre">$this-&gt;session</span></code>.</p>
<p>If you prefer to set your own class names you can pass its value to the
third parameter:</p>
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">load</span><span class="o">-&gt;</span><span class="na">library</span><span class="p">(</span><span class="s1">&#39;session&#39;</span><span class="p">,</span> <span class="s1">&#39;&#39;</span><span class="p">,</span> <span class="s1">&#39;my_session&#39;</span><span class="p">);</span>
<span class="c1">// Session class is now accessed using:</span>
<span class="nv">$this</span><span class="o">-&gt;</span><span class="na">my_session</span>
</pre></div>
</div>
</dd></dl>
<dl class="method">
<dt id="CI_Loader::view">
<code class="descname">view</code><span class="sig-paren">(</span><em>$view</em><span class="optional">[</span>, <em>$vars = array()</em><span class="optional">[</span>, <em>return = FALSE</em><span class="optional">]</span><span class="optional">]</span><span class="sig-paren">)</span><a class="headerlink" href="#CI_Loader::view" 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>$view</strong> (<em>string</em>) – View name</li>
<li><strong>$vars</strong> (<em>array</em>) – An associative array of variables</li>
<li><strong>$return</strong> (<em>bool</em>) – Whether to return the loaded view</li>
</ul>
</td>
</tr>
<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">View content string if $return is set to TRUE, otherwise CI_Loader instance (method chaining)</p>
</td>
</tr>
<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">mixed</p>
</td>
</tr>
</tbody>
</table>
<p>This method is used to load your View files. If you haven’t read the
<a class="reference internal" href="../general/views.html"><span class="doc">Views</span></a> section of the user guide it is
recommended that you do since it shows you how this method is
typically used.</p>
<p>The first parameter is required. It is the name of the view file you
would like to load.</p>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last">The .php file extension does not need to be specified unless
you use something other than .php.</p>
</div>
<p>The second <strong>optional</strong> parameter can take an associative array or an
object as input, which it runs through the PHP
<a class="reference external" href="http://php.net/extract">extract()</a> function to convert to variables
that can be used in your view files. Again, read the
<a class="reference internal" href="../general/views.html"><span class="doc">Views</span></a> page to learn how this might be useful.</p>
<p>The third <strong>optional</strong> parameter lets you change the behavior of the
method so that it returns data as a string rather than sending it to
your browser. This can be useful if you want to process the data in some
way. If you set the parameter to TRUE (boolean) it will return data. The
default behavior is FALSE, which sends it to your browser. Remember to
assign it to a variable if you want the data returned:</p>
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$string</span> <span class="o">=</span> <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">load</span><span class="o">-&gt;</span><span class="na">view</span><span class="p">(</span><span class="s1">&#39;myfile&#39;</span><span class="p">,</span> <span class="s1">&#39;&#39;</span><span class="p">,</span> <span class="k">TRUE</span><span class="p">);</span>
</pre></div>
</div>
</dd></dl>
<dl class="method">
<dt id="CI_Loader::vars">
<code class="descname">vars</code><span class="sig-paren">(</span><em>$vars</em><span class="optional">[</span>, <em>$val = ''</em><span class="optional">]</span><span class="sig-paren">)</span><a class="headerlink" href="#CI_Loader::vars" title="Permalink to this definition"></a></dt>
<dd><table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
<li><strong>$vars</strong> (<em>mixed</em>) – An array of variables or a single variable name</li>
<li><strong>$val</strong> (<em>mixed</em>) – Optional variable value</li>
</ul>
</td>
</tr>
<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">CI_Loader instance (method chaining)</p>
</td>
</tr>
<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">CI_Loader</p>
</td>
</tr>
</tbody>
</table>
<p>This method takes an associative array as input and generates
variables using the PHP <a class="reference external" href="http://php.net/extract">extract()</a>
function. This method produces the same result as using the second
parameter of the <code class="docutils literal"><span class="pre">$this-&gt;load-&gt;view()</span></code> method above. The reason you
might want to use this method independently is if you would like to
set some global variables in the constructor of your controller and have
them become available in any view file loaded from any method. You can
have multiple calls to this method. The data get cached and merged
into one array for conversion to variables.</p>
</dd></dl>
<dl class="method">
<dt id="CI_Loader::get_var">
<code class="descname">get_var</code><span class="sig-paren">(</span><em>$key</em><span class="sig-paren">)</span><a class="headerlink" href="#CI_Loader::get_var" title="Permalink to this definition"></a></dt>
<dd><table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
<li><strong>$key</strong> (<em>string</em>) – Variable name key</li>
</ul>
</td>
</tr>
<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">Value if key is found, NULL 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">mixed</p>
</td>
</tr>
</tbody>
</table>
<p>This method checks the associative array of variables available to
your views. This is useful if for any reason a var is set in a library
or another controller method using <code class="docutils literal"><span class="pre">$this-&gt;load-&gt;vars()</span></code>.</p>
</dd></dl>
<dl class="method">
<dt id="CI_Loader::get_vars">
<code class="descname">get_vars</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#CI_Loader::get_vars" title="Permalink to this definition"></a></dt>
<dd><table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Returns:</th><td class="field-body">An array of all assigned view variables</td>
</tr>
<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body">array</td>
</tr>
</tbody>
</table>
<p>This method retrieves all variables available to your views.</p>
</dd></dl>
<dl class="method">
<dt id="CI_Loader::clear_vars">
<code class="descname">clear_vars</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#CI_Loader::clear_vars" title="Permalink to this definition"></a></dt>
<dd><table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Returns:</th><td class="field-body">CI_Loader instance (method chaining)</td>
</tr>
<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body">CI_Loader</td>
</tr>
</tbody>
</table>
<p>Clears cached view variables.</p>
</dd></dl>
<dl class="method">
<dt id="CI_Loader::model">
<code class="descname">model</code><span class="sig-paren">(</span><em>$model</em><span class="optional">[</span>, <em>$name = ''</em><span class="optional">[</span>, <em>$db_conn = FALSE</em><span class="optional">]</span><span class="optional">]</span><span class="sig-paren">)</span><a class="headerlink" href="#CI_Loader::model" 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>$model</strong> (<em>mixed</em>) – Model name or an array containing multiple models</li>
<li><strong>$name</strong> (<em>string</em>) – Optional object name to assign the model to</li>
<li><strong>$db_conn</strong> (<em>string</em>) – Optional database configuration group to load</li>
</ul>
</td>
</tr>
<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">CI_Loader instance (method chaining)</p>
</td>
</tr>
<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">CI_Loader</p>
</td>
</tr>
</tbody>
</table>
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">load</span><span class="o">-&gt;</span><span class="na">model</span><span class="p">(</span><span class="s1">&#39;model_name&#39;</span><span class="p">);</span>
</pre></div>
</div>
<p>If your model is located in a subdirectory, include the relative path
from your models directory. For example, if you have a model located at
<em>application/models/blog/Queries.php</em> you’ll load it using:</p>
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">load</span><span class="o">-&gt;</span><span class="na">model</span><span class="p">(</span><span class="s1">&#39;blog/queries&#39;</span><span class="p">);</span>
</pre></div>
</div>
<p>If you would like your model assigned to a different object name you can
specify it via the second parameter of the loading method:</p>
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">load</span><span class="o">-&gt;</span><span class="na">model</span><span class="p">(</span><span class="s1">&#39;model_name&#39;</span><span class="p">,</span> <span class="s1">&#39;fubar&#39;</span><span class="p">);</span>
<span class="nv">$this</span><span class="o">-&gt;</span><span class="na">fubar</span><span class="o">-&gt;</span><span class="na">method</span><span class="p">();</span>
</pre></div>
</div>
</dd></dl>
<dl class="method">
<dt id="CI_Loader::database">
<code class="descname">database</code><span class="sig-paren">(</span><span class="optional">[</span><em>$params = ''</em><span class="optional">[</span>, <em>$return = FALSE</em><span class="optional">[</span>, <em>$query_builder = NULL</em><span class="optional">]</span><span class="optional">]</span><span class="optional">]</span><span class="sig-paren">)</span><a class="headerlink" href="#CI_Loader::database" 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>$params</strong> (<em>mixed</em>) – Database group name or configuration options</li>
<li><strong>$return</strong> (<em>bool</em>) – Whether to return the loaded database object</li>
<li><strong>$query_builder</strong> (<em>bool</em>) – Whether to load the Query Builder</li>
</ul>
</td>
</tr>
<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">Loaded CI_DB instance or FALSE on failure if $return is set to TRUE, otherwise CI_Loader instance (method chaining)</p>
</td>
</tr>
<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">mixed</p>
</td>
</tr>
</tbody>
</table>
<p>This method lets you load the database class. The two parameters are
<strong>optional</strong>. Please see the <a class="reference internal" href="../database/index.html"><span class="doc">database</span></a>
section for more info.</p>
</dd></dl>
<dl class="method">
<dt id="CI_Loader::dbforge">
<code class="descname">dbforge</code><span class="sig-paren">(</span><span class="optional">[</span><em>$db = NULL</em><span class="optional">[</span>, <em>$return = FALSE</em><span class="optional">]</span><span class="optional">]</span><span class="sig-paren">)</span><a class="headerlink" href="#CI_Loader::dbforge" title="Permalink to this definition"></a></dt>
<dd><table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
<li><strong>$db</strong> (<em>object</em>) – Database object</li>
<li><strong>$return</strong> (<em>bool</em>) – Whether to return the Database Forge instance</li>
</ul>
</td>
</tr>
<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">Loaded CI_DB_forge instance if $return is set to TRUE, otherwise CI_Loader instance (method chaining)</p>
</td>
</tr>
<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">mixed</p>
</td>
</tr>
</tbody>
</table>
<p>Loads the <a class="reference internal" href="../database/forge.html"><span class="doc">Database Forge</span></a> class, please refer
to that manual for more info.</p>
</dd></dl>
<dl class="method">
<dt id="CI_Loader::dbutil">
<code class="descname">dbutil</code><span class="sig-paren">(</span><span class="optional">[</span><em>$db = NULL</em><span class="optional">[</span>, <em>$return = FALSE</em><span class="optional">]</span><span class="optional">]</span><span class="sig-paren">)</span><a class="headerlink" href="#CI_Loader::dbutil" title="Permalink to this definition"></a></dt>
<dd><table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
<li><strong>$db</strong> (<em>object</em>) – Database object</li>
<li><strong>$return</strong> (<em>bool</em>) – Whether to return the Database Utilities instance</li>
</ul>
</td>
</tr>
<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">Loaded CI_DB_utility instance if $return is set to TRUE, otherwise CI_Loader instance (method chaining)</p>
</td>
</tr>
<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">mixed</p>
</td>
</tr>
</tbody>
</table>
<p>Loads the <a class="reference internal" href="../database/utilities.html"><span class="doc">Database Utilities</span></a> class, please
refer to that manual for more info.</p>
</dd></dl>
<dl class="method">
<dt id="CI_Loader::helper">
<code class="descname">helper</code><span class="sig-paren">(</span><em>$helpers</em><span class="sig-paren">)</span><a class="headerlink" href="#CI_Loader::helper" 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>$helpers</strong> (<em>mixed</em>) – Helper name as a string or an array containing multiple helpers</li>
</ul>
</td>
</tr>
<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">CI_Loader instance (method chaining)</p>
</td>
</tr>
<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">CI_Loader</p>
</td>
</tr>
</tbody>
</table>
<p>This method loads helper files, where file_name is the name of the
file, without the _helper.php extension.</p>
</dd></dl>
<dl class="method">
<dt id="CI_Loader::file">
<code class="descname">file</code><span class="sig-paren">(</span><em>$path</em><span class="optional">[</span>, <em>$return = FALSE</em><span class="optional">]</span><span class="sig-paren">)</span><a class="headerlink" href="#CI_Loader::file" title="Permalink to this definition"></a></dt>
<dd><table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
<li><strong>$path</strong> (<em>string</em>) – File path</li>
<li><strong>$return</strong> (<em>bool</em>) – Whether to return the loaded file</li>
</ul>
</td>
</tr>
<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">File contents if $return is set to TRUE, otherwise CI_Loader instance (method chaining)</p>
</td>
</tr>
<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">mixed</p>
</td>
</tr>
</tbody>
</table>
<p>This is a generic file loading method. Supply the filepath and name in
the first parameter and it will open and read the file. By default the
data is sent to your browser, just like a View file, but if you set the
second parameter to boolean TRUE it will instead return the data as a
string.</p>
</dd></dl>
<dl class="method">
<dt id="CI_Loader::language">
<code class="descname">language</code><span class="sig-paren">(</span><em>$files</em><span class="optional">[</span>, <em>$lang = ''</em><span class="optional">]</span><span class="sig-paren">)</span><a class="headerlink" href="#CI_Loader::language" title="Permalink to this definition"></a></dt>
<dd><table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
<li><strong>$files</strong> (<em>mixed</em>) – Language file name or an array of multiple language files</li>
<li><strong>$lang</strong> (<em>string</em>) – Language name</li>
</ul>
</td>
</tr>
<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">CI_Loader instance (method chaining)</p>
</td>
</tr>
<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">CI_Loader</p>
</td>
</tr>
</tbody>
</table>
<p>This method is an alias of the <a class="reference internal" href="language.html"><span class="doc">language loading
method</span></a>: <code class="docutils literal"><span class="pre">$this-&gt;lang-&gt;load()</span></code>.</p>
</dd></dl>
<dl class="method">
<dt id="CI_Loader::config">
<code class="descname">config</code><span class="sig-paren">(</span><em>$file</em><span class="optional">[</span>, <em>$use_sections = FALSE</em><span class="optional">[</span>, <em>$fail_gracefully = FALSE</em><span class="optional">]</span><span class="optional">]</span><span class="sig-paren">)</span><a class="headerlink" href="#CI_Loader::config" title="Permalink to this definition"></a></dt>
<dd><table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
<li><strong>$file</strong> (<em>string</em>) – Configuration file name</li>
<li><strong>$use_sections</strong> (<em>bool</em>) – Whether configuration values should be loaded into their own section</li>
<li><strong>$fail_gracefully</strong> (<em>bool</em>) – Whether to just return FALSE in case of failure</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 is an alias of the <a class="reference internal" href="config.html"><span class="doc">config file loading
method</span></a>: <code class="docutils literal"><span class="pre">$this-&gt;config-&gt;load()</span></code></p>
</dd></dl>
<dl class="method">
<dt id="CI_Loader::is_loaded">
<code class="descname">is_loaded</code><span class="sig-paren">(</span><em>$class</em><span class="sig-paren">)</span><a class="headerlink" href="#CI_Loader::is_loaded" 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>$class</strong> (<em>string</em>) – Class name</li>
</ul>
</td>
</tr>
<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">Singleton property name if found, FALSE if not</p>
</td>
</tr>
<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">mixed</p>
</td>
</tr>
</tbody>
</table>
<p>Allows you to check if a class has already been loaded or not.</p>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last">The word “class” here refers to libraries and drivers.</p>
</div>
<p>If the requested class has been loaded, the method returns its assigned
name in the CI Super-object and FALSE if it’s not:</p>
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">load</span><span class="o">-&gt;</span><span class="na">library</span><span class="p">(</span><span class="s1">&#39;form_validation&#39;</span><span class="p">);</span>
<span class="nv">$this</span><span class="o">-&gt;</span><span class="na">load</span><span class="o">-&gt;</span><span class="na">is_loaded</span><span class="p">(</span><span class="s1">&#39;Form_validation&#39;</span><span class="p">);</span> <span class="c1">// returns &#39;form_validation&#39;</span>
<span class="nv">$this</span><span class="o">-&gt;</span><span class="na">load</span><span class="o">-&gt;</span><span class="na">is_loaded</span><span class="p">(</span><span class="s1">&#39;Nonexistent_library&#39;</span><span class="p">);</span> <span class="c1">// returns FALSE</span>
</pre></div>
</div>
<div class="admonition important">
<p class="first admonition-title">Important</p>
<p class="last">If you have more than one instance of a class (assigned to
different properties), then the first one will be returned.</p>
</div>
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">load</span><span class="o">-&gt;</span><span class="na">library</span><span class="p">(</span><span class="s1">&#39;form_validation&#39;</span><span class="p">,</span> <span class="nv">$config</span><span class="p">,</span> <span class="s1">&#39;fv&#39;</span><span class="p">);</span>
<span class="nv">$this</span><span class="o">-&gt;</span><span class="na">load</span><span class="o">-&gt;</span><span class="na">library</span><span class="p">(</span><span class="s1">&#39;form_validation&#39;</span><span class="p">);</span>
<span class="nv">$this</span><span class="o">-&gt;</span><span class="na">load</span><span class="o">-&gt;</span><span class="na">is_loaded</span><span class="p">(</span><span class="s1">&#39;Form_validation&#39;</span><span class="p">);</span> <span class="c1">// returns &#39;fv&#39;</span>
</pre></div>
</div>
</dd></dl>
<dl class="method">
<dt id="CI_Loader::add_package_path">
<code class="descname">add_package_path</code><span class="sig-paren">(</span><em>$path</em><span class="optional">[</span>, <em>$view_cascade = TRUE</em><span class="optional">]</span><span class="sig-paren">)</span><a class="headerlink" href="#CI_Loader::add_package_path" 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>$path</strong> (<em>string</em>) – Path to add</li>
<li><strong>$view_cascade</strong> (<em>bool</em>) – Whether to use cascading views</li>
</ul>
</td>
</tr>
<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">CI_Loader instance (method chaining)</p>
</td>
</tr>
<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">CI_Loader</p>
</td>
</tr>
</tbody>
</table>
<p>Adding a package path instructs the Loader class to prepend a given path
for subsequent requests for resources. As an example, the “Foo Bar”
application package above has a library named Foo_bar.php. In our
controller, we’d do the following:</p>
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">load</span><span class="o">-&gt;</span><span class="na">add_package_path</span><span class="p">(</span><span class="nx">APPPATH</span><span class="o">.</span><span class="s1">&#39;third_party/foo_bar/&#39;</span><span class="p">)</span>
<span class="o">-&gt;</span><span class="na">library</span><span class="p">(</span><span class="s1">&#39;foo_bar&#39;</span><span class="p">);</span>
</pre></div>
</div>
</dd></dl>
<dl class="method">
<dt id="CI_Loader::remove_package_path">
<code class="descname">remove_package_path</code><span class="sig-paren">(</span><span class="optional">[</span><em>$path = ''</em><span class="optional">]</span><span class="sig-paren">)</span><a class="headerlink" href="#CI_Loader::remove_package_path" 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>$path</strong> (<em>string</em>) – Path to remove</li>
</ul>
</td>
</tr>
<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">CI_Loader instance (method chaining)</p>
</td>
</tr>
<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">CI_Loader</p>
</td>
</tr>
</tbody>
</table>
<p>When your controller is finished using resources from an application
package, and particularly if you have other application packages you
want to work with, you may wish to remove the package path so the Loader
no longer looks in that directory for resources. To remove the last path
added, simply call the method with no parameters.</p>
<p>Or to remove a specific package path, specify the same path previously
given to <code class="docutils literal"><span class="pre">add_package_path()</span></code> for a package.:</p>
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">load</span><span class="o">-&gt;</span><span class="na">remove_package_path</span><span class="p">(</span><span class="nx">APPPATH</span><span class="o">.</span><span class="s1">&#39;third_party/foo_bar/&#39;</span><span class="p">);</span>
</pre></div>
</div>
</dd></dl>
<dl class="method">
<dt id="CI_Loader::get_package_paths">
<code class="descname">get_package_paths</code><span class="sig-paren">(</span><span class="optional">[</span><em>$include_base = TRUE</em><span class="optional">]</span><span class="sig-paren">)</span><a class="headerlink" href="#CI_Loader::get_package_paths" title="Permalink to this definition"></a></dt>
<dd><table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
<li><strong>$include_base</strong> (<em>bool</em>) – Whether to include BASEPATH</li>
</ul>
</td>
</tr>
<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">An array of package paths</p>
</td>
</tr>
<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">array</p>
</td>
</tr>
</tbody>
</table>
<p>Returns all currently available package paths.</p>
</dd></dl>
</dd></dl>
</div>
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