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<li class="toctree-l2"><a class="reference internal" href="../database/query_builder.html">Query Builder Class</a></li>
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  <div class="section" id="using-codeigniter-libraries">
<h1>Using CodeIgniter Libraries<a class="headerlink" href="#using-codeigniter-libraries" title="Permalink to this headline">¶</a></h1>
<p>All of the available libraries are located in your <em>system/libraries/</em>
directory. In most cases, to use one of these classes involves initializing
it within a <a class="reference internal" href="controllers.html"><span class="doc">controller</span></a> using the following
initialization method:</p>
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">load</span><span class="o">-&gt;</span><span class="na">library</span><span class="p">(</span><span class="s1">&#39;class_name&#39;</span><span class="p">);</span>
</pre></div>
</div>
<p>Where ‘class_name’ is the name of the class you want to invoke. For
example, to load the <a class="reference internal" href="../libraries/form_validation.html"><span class="doc">Form Validation Library</span></a> you would do this:</p>
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">load</span><span class="o">-&gt;</span><span class="na">library</span><span class="p">(</span><span class="s1">&#39;form_validation&#39;</span><span class="p">);</span>
</pre></div>
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<p>Once initialized you can use it as indicated in the user guide page
corresponding to that class.</p>
<p>Additionally, multiple libraries can be loaded at the same time by
passing an array of libraries to the load method.</p>
<p>Example:</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>
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<div class="section" id="creating-your-own-libraries">
<h2>Creating Your Own Libraries<a class="headerlink" href="#creating-your-own-libraries" 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_libraries.html"><span class="doc">create your own libraries</span></a>.</p>
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