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148<li class="toctree-l2"><a class="reference internal" href="../libraries/table.html">HTML Table Class</a></li>
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164<li class="toctree-l2"><a class="reference internal" href="../database/queries.html">Running Queries</a></li>
165<li class="toctree-l2"><a class="reference internal" href="../database/results.html">Generating Query Results</a></li>
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167<li class="toctree-l2"><a class="reference internal" href="../database/query_builder.html">Query Builder Class</a></li>
168<li class="toctree-l2"><a class="reference internal" href="../database/transactions.html">Transactions</a></li>
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173<li class="toctree-l2"><a class="reference internal" href="../database/utilities.html">Database Utilities Class</a></li>
174<li class="toctree-l2"><a class="reference internal" href="../database/db_driver_reference.html">Database Driver Reference</a></li>
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181<li class="toctree-l2"><a class="reference internal" href="../helpers/captcha_helper.html">CAPTCHA Helper</a></li>
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183<li class="toctree-l2"><a class="reference internal" href="../helpers/date_helper.html">Date Helper</a></li>
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266<li class="toctree-l2"><a class="reference internal" href="../tutorial/conclusion.html">Conclusion</a></li>
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314<li class="toctree-l2"><a class="reference internal" href="../libraries/config.html">Config Class</a></li>
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424
425 <div class="section" id="creating-ancillary-classes">
426<h1>Creating Ancillary Classes<a class="headerlink" href="#creating-ancillary-classes" title="Permalink to this headline"></a></h1>
427<p>In some cases you may want to develop classes that exist apart from your
428controllers but have the ability to utilize all of CodeIgniter’s
429resources. This is easily possible as you’ll see.</p>
430<div class="section" id="get-instance">
431<h2>get_instance()<a class="headerlink" href="#get-instance" title="Permalink to this headline"></a></h2>
432<dl class="function">
433<dt id="get_instance">
434<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>
435<dd><table class="docutils field-list" frame="void" rules="none">
436<col class="field-name" />
437<col class="field-body" />
438<tbody valign="top">
439<tr class="field-odd field"><th class="field-name">Returns:</th><td class="field-body">Reference to your controller’s instance</td>
440</tr>
441<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body">CI_Controller</td>
442</tr>
443</tbody>
444</table>
445</dd></dl>
446
447<p><strong>Any class that you instantiate within your controller methods can
448access CodeIgniter’s native resources</strong> simply by using the
449<code class="docutils literal"><span class="pre">get_instance()</span></code> function. This function returns the main
450CodeIgniter object.</p>
451<p>Normally, to call any of the available methods, CodeIgniter requires
452you to use the <code class="docutils literal"><span class="pre">$this</span></code> construct:</p>
453<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$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>
454<span class="nv">$this</span><span class="o">-&gt;</span><span class="na">load</span><span class="o">-&gt;</span><span class="na">library</span><span class="p">(</span><span class="s1">&#39;session&#39;</span><span class="p">);</span>
455<span class="nv">$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>
456<span class="c1">// etc.</span>
457</pre></div>
458</div>
459<p><code class="docutils literal"><span class="pre">$this</span></code>, however, only works within your controllers, your models,
460or your views. If you would like to use CodeIgniter’s classes from
461within your own custom classes you can do so as follows:</p>
462<p>First, assign the CodeIgniter object to a variable:</p>
463<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$CI</span> <span class="o">=&amp;</span> <span class="nx">get_instance</span><span class="p">();</span>
464</pre></div>
465</div>
466<p>Once you’ve assigned the object to a variable, you’ll use that variable
467<em>instead</em> of <code class="docutils literal"><span class="pre">$this</span></code>:</p>
468<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$CI</span> <span class="o">=&amp;</span> <span class="nx">get_instance</span><span class="p">();</span>
469
470<span class="nv">$CI</span><span class="o">-&gt;</span><span class="na">load</span><span class="o">-&gt;</span><span class="na">helper</span><span class="p">(</span><span class="s1">&#39;url&#39;</span><span class="p">);</span>
471<span class="nv">$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>
472<span class="nv">$CI</span><span class="o">-&gt;</span><span class="na">config</span><span class="o">-&gt;</span><span class="na">item</span><span class="p">(</span><span class="s1">&#39;base_url&#39;</span><span class="p">);</span>
473<span class="c1">// etc.</span>
474</pre></div>
475</div>
476<p>If you’ll be using <code class="docutils literal"><span class="pre">get_instance()</span></code> inside another class, then it would
477be better if you assign it to a property. This way, you won’t need to call
478<code class="docutils literal"><span class="pre">get_instance()</span></code> in every single method.</p>
479<p>Example:</p>
480<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="k">class</span> <span class="nc">Example</span> <span class="p">{</span>
481
482 <span class="k">protected</span> <span class="nv">$CI</span><span class="p">;</span>
483
484 <span class="c1">// We&#39;ll use a constructor, as you can&#39;t directly call a function</span>
485 <span class="c1">// from a property definition.</span>
486 <span class="k">public</span> <span class="k">function</span> <span class="nf">__construct</span><span class="p">()</span>
487 <span class="p">{</span>
488 <span class="c1">// Assign the CodeIgniter super-object</span>
489 <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">CI</span> <span class="o">=&amp;</span> <span class="nx">get_instance</span><span class="p">();</span>
490 <span class="p">}</span>
491
492 <span class="k">public</span> <span class="k">function</span> <span class="nf">foo</span><span class="p">()</span>
493 <span class="p">{</span>
494 <span class="nv">$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>
495 <span class="nx">redirect</span><span class="p">();</span>
496 <span class="p">}</span>
497
498 <span class="k">public</span> <span class="k">function</span> <span class="nf">bar</span><span class="p">()</span>
499 <span class="p">{</span>
500 <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>
501 <span class="p">}</span>
502<span class="p">}</span>
503</pre></div>
504</div>
505<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
506after you instantiate the Example class, without the need to call
507<code class="docutils literal"><span class="pre">get_instance()</span></code> in each of them.</p>
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