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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<title>Application Flow Chart : CodeIgniter User Guide</title>
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<td><h1>CodeIgniter User Guide Version 2.1.4</h1></td>
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Appflow
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<h1>Application Flow Chart</h1>
<p>The following graphic illustrates how data flows throughout the system:</p>
<div><img src="../images/appflowchart.gif" width="769" height="212" 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>
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