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alt="classic layout" src="data:image/gif;base64,R0lGODlhFAAUAJEAAAAAADMzM////wAAACH5BAUUAAIALAAAAAAUABQAAAImlI+py+0PU5gRBRDM3DxbWoXis42X13USOLauUIqnlsaH/eY6UwAAOw==" /> </div> </ul> <hr/> </div> <div role="main" class="document"> <div class="section" id="application-flow-chart"> <h1>Application Flow Chart<a class="headerlink" href="#application-flow-chart" title="Permalink to this headline">¶</a></h1> <p>The following graphic illustrates how data flows throughout the system:</p> <p><img alt="CodeIgniter application flow" src="../_images/appflowchart.gif" /></p> <ol class="arabic simple"> <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. 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