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<td><h1>Code Igniter User Guide Version 1.5.2</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>
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<li>The index.php serves as the front controller, initializing the base resources needed to run Code Igniter.</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>
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