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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en"><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><title>Creating Ancillary Classes : CodeIgniter User Guide</title><style type='text/css' media='all'>@import url('../userguide.css');</style><link rel='stylesheet' type='text/css' media='all' href='../userguide.css' /><script type="text/javascript" src="../nav/nav.js"></script><script type="text/javascript" src="../nav/prototype.lite.js"></script><script type="text/javascript" src="../nav/moo.fx.js"></script><script type="text/javascript" src="../nav/user_guide_menu.js"></script><meta http-equiv='expires' content='-1' /><meta http-equiv= 'pragma' content='no-cache' /><meta name='robots' content='all' /><meta name='author' content='ExpressionEngine Dev Team' /><meta name='description' content='CodeIgniter User Guide' /></head><body><!-- START NAVIGATION --><div id="nav"><div id="nav_inner"><script type="text/javascript">create_menu('../');</script></div></div><div id="nav2"><a name="top"></a><a href="javascript:void(0);" onclick="myHeight.toggle();"><img src="../images/nav_toggle_darker.jpg" width="154" height="43" border="0" title="Toggle Table of Contents" alt="Toggle Table of Contents" /></a></div><div id="masthead"><table cellpadding="0" cellspacing="0" border="0" style="width:100%"><tr><td><h1>CodeIgniter User Guide Version 1.7.1</h1></td><td id="breadcrumb_right"><a href="../toc.html">Table of Contents Page</a></td></tr></table></div><!-- END NAVIGATION --><!-- START BREADCRUMB --><table cellpadding="0" cellspacing="0" border="0" style="width:100%"><tr><td id="breadcrumb"><a href="http://codeigniter.com/">CodeIgniter Home</a> › <a href="../index.html">User Guide Home</a> › Creating Ancillary Classes</td><td id="searchbox"><form method="get" action="http://www.google.com/search"><input type="hidden" name="as_sitesearch" id="as_sitesearch" value="codeigniter.com/user_guide/" />Search User Guide <input type="text" class="input" style="width:200px;" name="q" id="q" size="31" maxlength="255" value="" /> <input type="submit" class="submit" name="sa" value="Go" /></form></td></tr></table><!-- END BREADCRUMB --><br clear="all" /><!-- START CONTENT --><div id="content"><h1>Creating Ancillary Classes</h1><p>In some cases you may want to develop classes that exist apart from your controllers but have the ability toutilize all of CodeIgniter's resources. This is easily possible as you'll see.</p><h2>get_instance()</h2><p><strong>Any class that you instantiate within your controller functions can access CodeIgniter's native resources</strong> simply by using the <kbd>get_instance()</kbd> function.This function returns the main CodeIgniter object.</p><p>Normally, to call any of the available CodeIgniter functions requires you to use the <kbd>$this</kbd> construct:</p><code><strong>$this</strong>->load->helper('url');<br /><strong>$this</strong>->load->library('session');<br /><strong>$this</strong>->config->item('base_url');<br />etc.</code><p><kbd>$this</kbd>, however, only works within your controllers, your models, or your views.If you would like to use CodeIgniter's classes from within your own custom classes you can do so as follows:</p><p>First, assign the CodeIgniter object to a variable:</p><code>$CI =& get_instance();</code><p>Once you've assigned the object to a variable, you'll use that variable <em>instead</em> of <kbd>$this</kbd>:</p><code>$CI =& get_instance();<br /><br />$CI->load->helper('url');<br />$CI->load->library('session');<br />$CI->config->item('base_url');<br />etc.</code><p class="important"><strong>Note:</strong> You'll notice that the above get_instance() function is being passed by reference:<br /><br /><var>$CI =& get_instance();</var><br /><br />This is very important. Assigning by reference allows you to use the original CodeIgniter object rather than creating a copy of it.</p></div><!-- END CONTENT --><div id="footer"><p>Previous Topic: <a href="creating_libraries.html">Creating Core Libraries</a> · <a href="#top">Top of Page</a> · <a href="../index.html">User Guide Home</a> · Next Topic: <a href="autoloader.html">Auto-loading Resources</a></p><p><a href="http://codeigniter.com">CodeIgniter</a> · Copyright © 2006-2008 · <a href="http://ellislab.com/">Ellislab, Inc.</a></p></div></body></html>