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  <div class="section" id="autoloading-files">
<h1>Autoloading Files<a class="headerlink" href="#autoloading-files" title="Permalink to this headline">¶</a></h1>
<p>Every application consists of a large number of classes in many different locations.
The framework provides classes for core functionality. Your application will have a
number of libraries, models, and other entities to make it work. You might have third-party
classes that your project is using. Keeping track of where every single file is, and
hard-coding that location into your files in a series of <code class="docutils literal notranslate"><span class="pre">requires()</span></code> is a massive
headache and very error-prone. That’s where autoloaders come in.</p>
<p>CodeIgniter provides a very flexible autoloader that can be used with very little configuration.
It can locate individual non-namespaced classes, namespaced classes that adhere to
<a class="reference external" href="https://www.php-fig.org/psr/psr-4/">PSR4</a> autoloading
directory structures, and will even attempt to locate classes in common directories (like Controllers,
Models, etc).</p>
<p>For performance improvement, the core CodeIgniter components have been added to the classmap.</p>
<p>The autoloader works great by itself, but can also work with other autoloaders, like
<a class="reference external" href="https://getcomposer.org">Composer</a>, or even your own custom autoloaders, if needed.
Because they’re all registered through
<a class="reference external" href="https://www.php.net/manual/en/function.spl-autoload-register.php">spl_autoload_register</a>,
they work in sequence and don’t get in each other’s way.</p>
<p>The autoloader is always active, being registered with <code class="docutils literal notranslate"><span class="pre">spl_autoload_register()</span></code> at the
beginning of the framework’s execution.</p>
<div class="section" id="configuration">
<h2>Configuration<a class="headerlink" href="#configuration" title="Permalink to this headline">¶</a></h2>
<p>Initial configuration is done in <strong>/app/Config/Autoload.php</strong>. This file contains two primary
arrays: one for the classmap, and one for PSR4-compatible namespaces.</p>
</div>
<div class="section" id="namespaces">
<h2>Namespaces<a class="headerlink" href="#namespaces" title="Permalink to this headline">¶</a></h2>
<p>The recommended method for organizing your classes is to create one or more namespaces for your
application’s files. This is most important for any business-logic related classes, entity classes,
etc. The <code class="docutils literal notranslate"><span class="pre">psr4</span></code> array in the configuration file allows you to map the namespace to the directory
those classes can be found in:</p>
<div class="highlight-html+php notranslate"><div class="highlight"><pre><span></span><span class="nv">$psr4</span> <span class="o">=</span> <span class="p">[</span>
    <span class="s1">&#39;App&#39;</span>         <span class="o">=&gt;</span> <span class="nx">APPPATH</span><span class="p">,</span>
    <span class="s1">&#39;CodeIgniter&#39;</span> <span class="o">=&gt;</span> <span class="nx">SYSTEMPATH</span><span class="p">,</span>
<span class="p">];</span>
</pre></div>
</div>
<p>The key of each row is the namespace itself. This does not need a trailing slash. If you use double-quotes
to define the array, be sure to escape the backward slash. That means that it would be <code class="docutils literal notranslate"><span class="pre">My\\App</span></code>,
not <code class="docutils literal notranslate"><span class="pre">My\App</span></code>. The value is the location to the directory the classes can be found in. They should
have a trailing slash.</p>
<p>By default, the application folder is namespace to the <code class="docutils literal notranslate"><span class="pre">App</span></code> namespace. While you are not forced to namespace the controllers,
libraries, or models in the application directory, if you do, they will be found under the <code class="docutils literal notranslate"><span class="pre">App</span></code> namespace.
You may change this namespace by editing the <strong>/app/Config/Constants.php</strong> file and setting the
new namespace value under the <code class="docutils literal notranslate"><span class="pre">APP_NAMESPACE</span></code> setting:</p>
<div class="highlight-html+php notranslate"><div class="highlight"><pre><span></span><span class="nb">define</span><span class="p">(</span><span class="s1">&#39;APP_NAMESPACE&#39;</span><span class="p">,</span> <span class="s1">&#39;App&#39;</span><span class="p">);</span>
</pre></div>
</div>
<p>You will need to modify any existing files that are referencing the current namespace.</p>
<div class="admonition important">
<p class="first admonition-title">Important</p>
<p class="last">Config files are namespaced in the <code class="docutils literal notranslate"><span class="pre">Config</span></code> namespace, not in <code class="docutils literal notranslate"><span class="pre">App\Config</span></code> as you might
expect. This allows the core system files to always be able to locate them, even when the application
namespace has changed.</p>
</div>
</div>
<div class="section" id="classmap">
<h2>Classmap<a class="headerlink" href="#classmap" title="Permalink to this headline">¶</a></h2>
<p>The classmap is used extensively by CodeIgniter to eke the last ounces of performance out of the system
by not hitting the file-system with extra <code class="docutils literal notranslate"><span class="pre">is_file()</span></code> calls. You can use the classmap to link to
third-party libraries that are not namespaced:</p>
<div class="highlight-html+php notranslate"><div class="highlight"><pre><span></span><span class="nv">$classmap</span> <span class="o">=</span> <span class="p">[</span>
    <span class="s1">&#39;Markdown&#39;</span> <span class="o">=&gt;</span> <span class="nx">APPPATH</span> <span class="o">.</span> <span class="s1">&#39;third_party/markdown.php&#39;</span>
<span class="p">];</span>
</pre></div>
</div>
<p>The key of each row is the name of the class that you want to locate. The value is the path to locate it at.</p>
</div>
<div class="section" id="composer-support">
<h2>Composer Support<a class="headerlink" href="#composer-support" title="Permalink to this headline">¶</a></h2>
<p>Composer support is automatically initialized by default. By default, it looks for Composer’s autoload file at
<code class="docutils literal notranslate"><span class="pre">ROOTPATH</span> <span class="pre">.</span> <span class="pre">'vendor/autoload.php'</span></code>. If you need to change the location of that file for any reason, you can modify
the value defined in <code class="docutils literal notranslate"><span class="pre">Config\Constants.php</span></code>.</p>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last">If the same namespace is defined in both CodeIgniter and Composer, CodeIgniter’s autoloader will be
the first one to get a chance to locate the file.</p>
</div>
</div>
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