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echo"
Fallagassrini
";
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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&#8217;s
resources. This is easily possible as you&#8217;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">
<tt class="descname">get_instance</tt><big>(</big><big>)</big><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&#8217;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&#8217;s native resources</strong> simply by using the
<tt class="docutils literal"><span class="pre">get_instance()</span></tt> function. This function returns the main
CodeIgniter object.</p>
<p>Normally, to call any of the available CodeIgniter methods requires
you to use the <tt class="docutils literal"><span class="pre">$this</span></tt> construct:</p>
<div class="highlight-ci"><div class="highlight"><pre><span class="nv">$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><tt class="docutils literal"><span class="pre">$this</span></tt>, however, only works within your controllers, your models,
or your views. If you would like to use CodeIgniter&#8217;s classes from
within your own custom classes you can do so as follows:</p>
<p>First, assign the CodeIgniter object to a variable:</p>
<div class="highlight-ci"><div class="highlight"><pre><span class="nv">$CI</span> <span class="o">=&amp;</span> <span class="nx">get_instance</span><span class="p">();</span>
</pre></div>
</div>
<p>Once you&#8217;ve assigned the object to a variable, you&#8217;ll use that variable
<em>instead</em> of <tt class="docutils literal"><span class="pre">$this</span></tt>:</p>
<div class="highlight-ci"><div class="highlight"><pre><span class="nv">$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&#8217;ll be using <tt class="docutils literal"><span class="pre">get_instance()</span></tt> inside another class, then it would
be better if you assign it to a property. This way, you won&#8217;t need to call
<tt class="docutils literal"><span class="pre">get_instance()</span></tt> in every single method.</p>
<p>Example:</p>
<div class="highlight-ci"><div class="highlight"><pre><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 <tt class="docutils literal"><span class="pre">foo()</span></tt> and <tt class="docutils literal"><span class="pre">bar()</span></tt> will work
after you instantiate the Example class, without the need to call
<tt class="docutils literal"><span class="pre">get_instance()</span></tt> in each of them.</p>
</div>
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