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| <td><h1>CodeIgniter User Guide Version 2.0.2</h1></td> |
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| <h1>Application Flow Chart</h1> |
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| <p>The following graphic illustrates how data flows throughout the system:</p> |
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| <div><img src="../images/appflowchart.gif" width="697" height="205" border="0" alt="CodeIgniter application flow" /></div> |
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| <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, 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> |
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