| <!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>Application Flow Chart : 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 1.7.2</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> › |
| Appflow |
| </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>Application Flow Chart</h1> |
| |
| <p>The following graphic illustrates how data flows throughout the system:</p> |
| |
| <div><img src="../images/appflowchart.gif" width="697" height="205" border="0" alt="CodeIgniter application flow" /></div> |
| |
| |
| <ol> |
| <li>The index.php serves as the front controller, initializing the base resources needed to run CodeIgniter.</li> |
| <li>The Router examines the HTTP request to determine what should be done with it.</li> |
| <li>If a cache file exists, it is sent directly to the browser, bypassing the normal system execution.</li> |
| <li>Security. Before the application controller is loaded, the HTTP request and any user submitted data is filtered for security.</li> |
| <li>The Controller loads the model, core libraries, plugins, helpers, and any other resources needed to process the specific request.</li> |
| <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 |
| that on subsequent requests it can be served.</li> |
| </ol> |
| |
| |
| |
| |
| </div> |
| <!-- END CONTENT --> |
| |
| |
| <div id="footer"> |
| <p> |
| Previous Topic: <a href="features.html">CodeIgniter Features</a> |
| · |
| <a href="#top">Top of Page</a> · |
| <a href="../index.html">User Guide Home</a> · |
| Next Topic: <a href="mvc.html">Model-View-Controller</a> |
| </p> |
| <p><a href="http://codeigniter.com">CodeIgniter</a> · Copyright © 2006-2010 · <a href="http://ellislab.com/">Ellislab, Inc.</a></p> |
| </div> |
| |
| </body> |
| </html> |