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  <div class="section" id="creating-ancillary-classes">
<h1>Creating Ancillary Classes<a class="headerlink" href="#creating-ancillary-classes" title="Permalink to this headline">¶</a></h1>
<p>In some cases you may want to develop classes that exist apart from your
controllers but have the ability to utilize all of CodeIgniter’s
resources. This is easily possible as you’ll see.</p>
<div class="section" id="get-instance">
<h2>get_instance()<a class="headerlink" href="#get-instance" title="Permalink to this headline">¶</a></h2>
<dl class="function">
<dt id="get_instance">
<code class="descname">get_instance</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#get_instance" 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">Reference to your controller’s instance</td>
</tr>
<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body">CI_Controller</td>
</tr>
</tbody>
</table>
</dd></dl>

<p><strong>Any class that you instantiate within your controller methods can
access CodeIgniter’s native resources</strong> simply by using the
<code class="docutils literal"><span class="pre">get_instance()</span></code> function. This function returns the main
CodeIgniter object.</p>
<p>Normally, to call any of the available methods, CodeIgniter requires
you to use 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">-&gt;</span><span class="na">load</span><span class="o">-&gt;</span><span class="na">helper</span><span class="p">(</span><span class="s1">&#39;url&#39;</span><span class="p">);</span>
<span class="nv">$this</span><span class="o">-&gt;</span><span class="na">load</span><span class="o">-&gt;</span><span class="na">library</span><span class="p">(</span><span class="s1">&#39;session&#39;</span><span class="p">);</span>
<span class="nv">$this</span><span class="o">-&gt;</span><span class="na">config</span><span class="o">-&gt;</span><span class="na">item</span><span class="p">(</span><span class="s1">&#39;base_url&#39;</span><span class="p">);</span>
<span class="c1">// etc.</span>
</pre></div>
</div>
<p><code class="docutils literal"><span class="pre">$this</span></code>, however, only works within your controllers, your models,
or your views. If you would like to use CodeIgniter’s classes from
within your own custom classes you can do so as follows:</p>
<p>First, assign the CodeIgniter object to a variable:</p>
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$CI</span> <span class="o">=&amp;</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">=&amp;</span> <span class="nx">get_instance</span><span class="p">();</span>

<span class="nv">$CI</span><span class="o">-&gt;</span><span class="na">load</span><span class="o">-&gt;</span><span class="na">helper</span><span class="p">(</span><span class="s1">&#39;url&#39;</span><span class="p">);</span>
<span class="nv">$CI</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="nv">$CI</span><span class="o">-&gt;</span><span class="na">config</span><span class="o">-&gt;</span><span class="na">item</span><span class="p">(</span><span class="s1">&#39;base_url&#39;</span><span class="p">);</span>
<span class="c1">// etc.</span>
</pre></div>
</div>
<p>If you’ll be using <code class="docutils literal"><span class="pre">get_instance()</span></code> inside another class, then it would
be better if you assign it to a property. This way, you won’t need to call
<code class="docutils literal"><span class="pre">get_instance()</span></code> in every single method.</p>
<p>Example:</p>
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="k">class</span> <span class="nc">Example</span> <span class="p">{</span>

<span class="k">protected</span> <span class="nv">$CI</span><span class="p">;</span>

<span class="c1">// We&#39;ll use a constructor, as you can&#39;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">-&gt;</span><span class="na">CI</span> <span class="o">=&amp;</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">-&gt;</span><span class="na">CI</span><span class="o">-&gt;</span><span class="na">load</span><span class="o">-&gt;</span><span class="na">helper</span><span class="p">(</span><span class="s1">&#39;url&#39;</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="nv">$this</span><span class="o">-&gt;</span><span class="na">CI</span><span class="o">-&gt;</span><span class="na">config</span><span class="o">-&gt;</span><span class="na">item</span><span class="p">(</span><span class="s1">&#39;base_url&#39;</span><span class="p">);</span>
        <span class="p">}</span>
<span class="p">}</span>
</pre></div>
</div>
<p>In the above example, both methods <code class="docutils literal"><span class="pre">foo()</span></code> and <code class="docutils literal"><span class="pre">bar()</span></code> will work
after you instantiate the Example class, without the need to call
<code class="docutils literal"><span class="pre">get_instance()</span></code> in each of them.</p>
</div>
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