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| author | Eric Barnes <eric@ericlbarnes.com> | 2011-11-27 06:30:22 +0100 |
|---|---|---|
| committer | Eric Barnes <eric@ericlbarnes.com> | 2011-11-27 06:30:22 +0100 |
| commit | 7e66dda705743cbfe1d522ddb73e5694006ec42c (patch) | |
| tree | c08b63deb28c09ec49d9173280f1ca234debfe50 /user_guide/general/hooks.html | |
| parent | 7eceb03f083643254c7393c6b5ebe539e344a1ba (diff) | |
| parent | e101593561a10632c1d63180436b19f1d7115046 (diff) | |
Merge branch 'refs/heads/develop' into feature/unit-tests
Conflicts:
user_guide/helpers/number_helper.html
Diffstat (limited to 'user_guide/general/hooks.html')
| -rw-r--r-- | user_guide/general/hooks.html | 165 |
1 files changed, 0 insertions, 165 deletions
diff --git a/user_guide/general/hooks.html b/user_guide/general/hooks.html deleted file mode 100644 index c0d616c50..000000000 --- a/user_guide/general/hooks.html +++ /dev/null @@ -1,165 +0,0 @@ -<!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>Hooks : 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 2.0.3</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> › -Hooks - Extending the Framework Core -</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>Hooks - Extending the Framework Core</h1> - -<p>CodeIgniter's Hooks feature provides a means to tap into and modify the inner workings of the framework without hacking the core files. -When CodeIgniter runs it follows a specific execution process, diagramed in the <a href="../overview/appflow.html">Application Flow</a> page. -There may be instances, however, where you'd like to cause some action to take place at a particular stage in the execution process. -For example, you might want to run a script right before your controllers get loaded, or right after, or you might want to trigger one of -your own scripts in some other location. -</p> - -<h2>Enabling Hooks</h2> - -<p>The hooks feature can be globally enabled/disabled by setting the following item in the <kbd>application/config/config.php</kbd> file:</p> - -<code>$config['enable_hooks'] = TRUE;</code> - - -<h2>Defining a Hook</h2> - -<p>Hooks are defined in <dfn>application/config/hooks.php</dfn> file. Each hook is specified as an array with this prototype:</p> - -<code> -$hook['pre_controller'] = array(<br /> - 'class' => 'MyClass',<br /> - 'function' => 'Myfunction',<br /> - 'filename' => 'Myclass.php',<br /> - 'filepath' => 'hooks',<br /> - 'params' => array('beer', 'wine', 'snacks')<br /> - );</code> - -<p><strong>Notes:</strong><br />The array index correlates to the name of the particular hook point you want to -use. In the above example the hook point is <kbd>pre_controller</kbd>. A list of hook points is found below. -The following items should be defined in your associative hook array:</p> - -<ul> -<li><strong>class</strong> The name of the class you wish to invoke. If you prefer to use a procedural function instead of a class, leave this item blank.</li> -<li><strong>function</strong> The function name you wish to call.</li> -<li><strong>filename</strong> The file name containing your class/function.</li> -<li><strong>filepath</strong> The name of the directory containing your script. Note: Your script must be located in a directory INSIDE your <kbd>application</kbd> folder, so the file path is relative to that folder. For example, if your script is located in <dfn>application/hooks</dfn>, you will simply use <samp>hooks</samp> as your filepath. If your script is located in <dfn>application/hooks/utilities</dfn> you will use <samp>hooks/utilities</samp> as your filepath. No trailing slash.</li> -<li><strong>params</strong> Any parameters you wish to pass to your script. This item is optional.</li> -</ul> - - -<h2>Multiple Calls to the Same Hook</h2> - -<p>If want to use the same hook point with more then one script, simply make your array declaration multi-dimensional, like this:</p> - -<code> -$hook['pre_controller']<kbd>[]</kbd> = array(<br /> - 'class' => 'MyClass',<br /> - 'function' => 'Myfunction',<br /> - 'filename' => 'Myclass.php',<br /> - 'filepath' => 'hooks',<br /> - 'params' => array('beer', 'wine', 'snacks')<br /> - );<br /> -<br /> -$hook['pre_controller']<kbd>[]</kbd> = array(<br /> - 'class' => 'MyOtherClass',<br /> - 'function' => 'MyOtherfunction',<br /> - 'filename' => 'Myotherclass.php',<br /> - 'filepath' => 'hooks',<br /> - 'params' => array('red', 'yellow', 'blue')<br /> - );</code> - -<p>Notice the brackets after each array index:</p> - -<code>$hook['pre_controller']<kbd>[]</kbd></code> - -<p>This permits you to have the same hook point with multiple scripts. The order you define your array will be the execution order.</p> - - -<h2>Hook Points</h2> - -<p>The following is a list of available hook points.</p> - -<ul> - <li><strong>pre_system</strong><br /> - Called very early during system execution. Only the benchmark and hooks class have been loaded at this point. No routing or other processes have happened.</li> - <li><strong>pre_controller</strong><br /> - Called immediately prior to any of your controllers being called. All base classes, routing, and security checks have been done.</li> - <li><strong>post_controller_constructor</strong><br /> - Called immediately after your controller is instantiated, but prior to any method calls happening.</li> - <li><strong>post_controller</strong><br /> - Called immediately after your controller is fully executed.</li> - <li><strong>display_override</strong><br /> - Overrides the <dfn>_display()</dfn> function, used to send the finalized page to the web browser at the end of system execution. This permits you to - use your own display methodology. Note that you will need to reference the CI superobject with <dfn>$this->CI =& get_instance()</dfn> and then the finalized data will be available by calling <dfn>$this->CI->output->get_output()</dfn></li> - <li><strong>cache_override</strong><br /> - Enables you to call your own function instead of the <dfn>_display_cache()</dfn> function in the output class. This permits you to use your own cache display mechanism.</li> - <li><strong>post_system</strong><br /> - Called after the final rendered page is sent to the browser, at the end of system execution after the finalized data is sent to the browser.</li> - </ul> -</div> -<!-- END CONTENT --> - - -<div id="footer"> -<p> -Previous Topic: <a href="core_classes.html">Creating Core Classes</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 - 2011 · <a href="http://ellislab.com/">EllisLab, Inc.</a></p> -</div> - -</body> -</html>
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