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  <div class="section" id="using-codeigniter-drivers">
<h1>Using CodeIgniter Drivers<a class="headerlink" href="#using-codeigniter-drivers" title="Permalink to this headline">¶</a></h1>
<p>Drivers are a special type of Library that has a parent class and any
number of potential child classes. Child classes have access to the
parent class, but not their siblings. Drivers provide an elegant syntax
in your <a class="reference internal" href="controllers.html"><span class="doc">controllers</span></a> for libraries that benefit
from or require being broken down into discrete classes.</p>
<p>Drivers are found in the <em>system/libraries/</em> directory, in their own
sub-directory which is identically named to the parent library class.
Also inside that directory is a subdirectory named drivers, which
contains all of the possible child class files.</p>
<p>To use a driver you will initialize it within a controller using the
following initialization method:</p>
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">load</span><span class="o">-&gt;</span><span class="na">driver</span><span class="p">(</span><span class="s1">&#39;class_name&#39;</span><span class="p">);</span>
</pre></div>
</div>
<p>Where class name is the name of the driver class you want to invoke. For
example, to load a driver named “Some_parent” you would do this:</p>
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$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;some_parent&#39;</span><span class="p">);</span>
</pre></div>
</div>
<p>Methods of that class can then be invoked with:</p>
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">some_parent</span><span class="o">-&gt;</span><span class="na">some_method</span><span class="p">();</span>
</pre></div>
</div>
<p>The child classes, the drivers themselves, can then be called directly
through the parent class, without initializing them:</p>
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">some_parent</span><span class="o">-&gt;</span><span class="na">child_one</span><span class="o">-&gt;</span><span class="na">some_method</span><span class="p">();</span>
<span class="nv">$this</span><span class="o">-&gt;</span><span class="na">some_parent</span><span class="o">-&gt;</span><span class="na">child_two</span><span class="o">-&gt;</span><span class="na">another_method</span><span class="p">();</span>
</pre></div>
</div>
<div class="section" id="creating-your-own-drivers">
<h2>Creating Your Own Drivers<a class="headerlink" href="#creating-your-own-drivers" title="Permalink to this headline">¶</a></h2>
<p>Please read the section of the user guide that discusses how to <a class="reference internal" href="creating_drivers.html"><span class="doc">create
your own drivers</span></a>.</p>
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