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www.giggi.me / code-igniter-v3-giggi / 68d7bd62840b1154a4a6d9b5caa41cbdd73a851a / . / user_guide / overview / appflow.html
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adminb0dd10f2006-08-25 17:25:49 +0000[diff] [blame]1<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
Derek Allardafd99ac2008-01-19 19:59:14 +0000[diff] [blame]2<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
adminb0dd10f2006-08-25 17:25:49 +0000[diff] [blame]3<head>
4
Derek Allard8039d4c2008-05-31 02:47:56 +0000[diff] [blame]5<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
Derek Jonesfd93d222008-05-06 15:18:50 +0000[diff] [blame]6<title>Application Flow Chart : CodeIgniter User Guide</title>
adminb0dd10f2006-08-25 17:25:49 +0000[diff] [blame]7
8<style type='text/css' media='all'>@import url('../userguide.css');</style>
9<link rel='stylesheet' type='text/css' media='all' href='../userguide.css' />
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Derek Allard3d879d52008-01-18 19:41:32 +0000[diff] [blame]19<meta name='author' content='ExpressionEngine Dev Team' />
Derek Allardd2df9bc2007-04-15 17:41:17 +0000[diff] [blame]20<meta name='description' content='CodeIgniter User Guide' />
adminb0dd10f2006-08-25 17:25:49 +0000[diff] [blame]21
22</head>
23<body>
24
25<!-- START NAVIGATION -->
26<div id="nav"><div id="nav_inner"><script type="text/javascript">create_menu('../');</script></div></div>
27<div id="nav2"><a name="top"></a><a href="javascript:void(0);" onclick="myHeight.toggle();"><img src="../images/nav_toggle.jpg" width="153" height="44" border="0" title="Toggle Table of Contents" alt="Toggle Table of Contents" /></a></div>
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29<table cellpadding="0" cellspacing="0" border="0" style="width:100%">
30<tr>
Derek Jones1ca3fc42008-06-27 00:19:33 +0000[diff] [blame]31<td><h1>CodeIgniter User Guide Version 1.6.3</h1></td>
adminc0d5d522006-10-30 19:40:35 +0000[diff] [blame]32<td id="breadcrumb_right"><a href="../toc.html">Table of Contents Page</a></td>
adminb0dd10f2006-08-25 17:25:49 +0000[diff] [blame]33</tr>
34</table>
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40<table cellpadding="0" cellspacing="0" border="0" style="width:100%">
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Derek Jones7a9193a2008-01-21 18:39:20 +0000[diff] [blame]43<a href="http://codeigniter.com/">CodeIgniter Home</a> &nbsp;&#8250;&nbsp;
adminb0dd10f2006-08-25 17:25:49 +0000[diff] [blame]44<a href="../index.html">User Guide Home</a> &nbsp;&#8250;&nbsp;
45Appflow
46</td>
Derek Allardbc030912007-06-24 18:25:29 +0000[diff] [blame]47<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&nbsp; <input type="text" class="input" style="width:200px;" name="q" id="q" size="31" maxlength="255" value="" />&nbsp;<input type="submit" class="submit" name="sa" value="Go" /></form></td>
adminb0dd10f2006-08-25 17:25:49 +0000[diff] [blame]48</tr>
49</table>
50<!-- END BREADCRUMB -->
51
52<br clear="all" />
53
54
55<!-- START CONTENT -->
56<div id="content">
57
58
59<h1>Application Flow Chart</h1>
60
61<p>The following graphic illustrates how data flows throughout the system:</p>
62
Derek Allardce66d152008-03-04 20:55:55 +0000[diff] [blame]63<div><img src="../images/appflowchart.gif" width="697" height="205" border="0" alt="CodeIgniter application flow" /></div>
adminb0dd10f2006-08-25 17:25:49 +0000[diff] [blame]64
65
66<ol>
Derek Allardd2df9bc2007-04-15 17:41:17 +0000[diff] [blame]67<li>The index.php serves as the front controller, initializing the base resources needed to run CodeIgniter.</li>
adminb0dd10f2006-08-25 17:25:49 +0000[diff] [blame]68<li>The Router examines the HTTP request to determine what should be done with it.</li>
69<li>If a cache file exists, it is sent directly to the browser, bypassing the normal system execution.</li>
70<li>Security. Before the application controller is loaded, the HTTP request and any user submitted data is filtered for security.</li>
71<li>The Controller loads the model, core libraries, plugins, helpers, and any other resources needed to process the specific request.</li>
72<li>The finalized View is rendered then sent to the web browser to be seen. If caching is enabled, the view is cached first so
73that on subsequent requests it can be served.</li>
74</ol>
75
76
77
78
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81
82
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84<p>
Derek Allardd2df9bc2007-04-15 17:41:17 +0000[diff] [blame]85Previous Topic:&nbsp;&nbsp;<a href="features.html">CodeIgniter Features</a>
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89Next Topic:&nbsp;&nbsp;<a href="mvc.html">Model-View-Controller</a>
Derek Allardc6441282007-07-04 23:54:32 +0000[diff] [blame]90</p>
Derek Jones07870432008-02-13 03:49:26 +0000[diff] [blame]91<p><a href="http://codeigniter.com">CodeIgniter</a> &nbsp;&middot;&nbsp; Copyright &#169; 2006-2008 &nbsp;&middot;&nbsp; <a href="http://ellislab.com/">Ellislab, Inc.</a></p>
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