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Helper</a></li> </ul> </li> </ul> </div> </nav> <section data-toggle="wy-nav-shift" class="wy-nav-content-wrap"> <nav class="wy-nav-top" role="navigation" aria-label="top navigation"> <i data-toggle="wy-nav-top" class="fa fa-bars"></i> <a href="../index.html">CodeIgniter</a> </nav> <div class="wy-nav-content"> <div class="rst-content"> <div role="navigation" aria-label="breadcrumbs navigation"> <ul class="wy-breadcrumbs"> <li><a href="../index.html">Docs</a> »</li> <li><a href="index.html">General Topics</a> »</li> <li>Creating Ancillary Classes</li> <li class="wy-breadcrumbs-aside"> </li> <div style="float:right;margin-left:5px;" id="closeMe"> <img title="Classic Layout" alt="classic layout" src="data:image/gif;base64,R0lGODlhFAAUAJEAAAAAADMzM////wAAACH5BAUUAAIALAAAAAAUABQAAAImlI+py+0PU5gRBRDM3DxbWoXis42X13USOLauUIqnlsaH/eY6UwAAOw==" /> </div> </ul> <hr/> </div> <div role="main" class="document"> <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">-></span><span class="na">load</span><span class="o">-></span><span class="na">helper</span><span class="p">(</span><span class="s1">'url'</span><span class="p">);</span> <span class="nv">$this</span><span class="o">-></span><span class="na">load</span><span class="o">-></span><span class="na">library</span><span class="p">(</span><span class="s1">'session'</span><span class="p">);</span> <span class="nv">$this</span><span class="o">-></span><span class="na">config</span><span class="o">-></span><span class="na">item</span><span class="p">(</span><span class="s1">'base_url'</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">=&</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">=&</span> <span class="nx">get_instance</span><span class="p">();</span> <span class="nv">$CI</span><span class="o">-></span><span class="na">load</span><span class="o">-></span><span class="na">helper</span><span class="p">(</span><span class="s1">'url'</span><span class="p">);</span> <span class="nv">$CI</span><span class="o">-></span><span class="na">load</span><span class="o">-></span><span class="na">library</span><span class="p">(</span><span class="s1">'session'</span><span class="p">);</span> <span class="nv">$CI</span><span class="o">-></span><span class="na">config</span><span class="o">-></span><span class="na">item</span><span class="p">(</span><span class="s1">'base_url'</span><span class="p">);</span> <span class="c1">// etc.</span> </pre></div> </div> <p>If you’ll be using <code class="docutils literal"><span class="pre">get_instance()</span></code> inside another class, then it would be better if you assign it to a property. This way, you won’t need to call <code class="docutils literal"><span class="pre">get_instance()</span></code> in every single method.</p> <p>Example:</p> <div class="highlight-ci"><div class="highlight"><pre><span></span><span class="k">class</span> <span class="nc">Example</span> <span class="p">{</span> <span class="k">protected</span> <span class="nv">$CI</span><span class="p">;</span> <span class="c1">// We'll use a constructor, as you can'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">$this</span><span class="o">-></span><span class="na">CI</span> <span class="o">=&</span> <span class="nx">get_instance</span><span class="p">();</span> <span class="p">}</span> <span class="k">public</span> <span class="k">function</span> <span class="nf">foo</span><span class="p">()</span> <span class="p">{</span> <span class="nv">$this</span><span class="o">-></span><span class="na">CI</span><span class="o">-></span><span class="na">load</span><span class="o">-></span><span class="na">helper</span><span class="p">(</span><span class="s1">'url'</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">-></span><span class="na">CI</span><span class="o">-></span><span class="na">config</span><span class="o">-></span><span class="na">item</span><span class="p">(</span><span class="s1">'base_url'</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> </div> </div> <footer> <div class="rst-footer-buttons" role="navigation" aria-label="footer navigation"> <a href="hooks.html" class="btn btn-neutral float-right" title="Hooks - Extending the Framework Core">Next <span class="fa fa-arrow-circle-right"></span></a> <a href="core_classes.html" class="btn btn-neutral" title="Creating Core System Classes"><span class="fa fa-arrow-circle-left"></span> Previous</a> </div> <hr/> <div role="contentinfo"> <p> © Copyright 2014 - 2019, British Columbia Institute of Technology. Last updated on Sep 19, 2019. </p> </div> Built with <a href="http://sphinx-doc.org/">Sphinx</a> using a <a href="https://github.com/snide/sphinx_rtd_theme">theme</a> provided by <a href="https://readthedocs.org">Read the Docs</a>. </footer> </div> </div> </section> </div> <script type="text/javascript"> var DOCUMENTATION_OPTIONS = { URL_ROOT:'../', VERSION:'3.1.11', COLLAPSE_INDEX:false, FILE_SUFFIX:'.html', HAS_SOURCE: false }; </script> <script type="text/javascript" src="../_static/jquery.js"></script> <script type="text/javascript" src="../_static/underscore.js"></script> <script type="text/javascript" src="../_static/doctools.js"></script> <script type="text/javascript" src="../_static/js/theme.js"></script> <script type="text/javascript"> jQuery(function () { SphinxRtdTheme.StickyNav.enable(); }); </script> </body> </html> Save