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3 | <head> | |
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5 | <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> | |
6 | <title>Application Flow Chart : CodeIgniter User Guide</title> | |
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8 | <style type='text/css' media='all'>@import url('../userguide.css');</style> | |
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20 | <meta name='description' content='CodeIgniter User Guide' /> | |
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26 | <div id="nav"><div id="nav_inner"><script type="text/javascript">create_menu('../');</script></div></div> | |
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28 | <div id="masthead"> | |
29 | <table cellpadding="0" cellspacing="0" border="0" style="width:100%"> | |
30 | <tr> | |
31 | <td><h1>CodeIgniter User Guide Version 2.1.3</h1></td> | |
32 | <td id="breadcrumb_right"><a href="../toc.html">Table of Contents Page</a></td> | |
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43 | <a href="http://codeigniter.com/">CodeIgniter Home</a> › | |
44 | <a href="../index.html">User Guide Home</a> › | |
45 | Appflow | |
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47 | <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> | |
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52 | <br clear="all" /> | |
53 | ||
54 | ||
55 | <!-- START CONTENT --> | |
56 | <div id="content"> | |
57 | ||
58 | ||
59 | <h1>Application Flow Chart</h1> | |
60 | ||
61 | <p>The following graphic illustrates how data flows throughout the system:</p> | |
62 | ||
63 | <div><img src="../images/appflowchart.gif" width="769" height="212" alt="CodeIgniter application flow"></div> | |
64 | ||
65 | ||
66 | <ol> | |
67 | <li>The index.php serves as the front controller, initializing the base resources needed to run CodeIgniter.</li> | |
68 | <li>The Router examines the HTTP request to determine what should be done with it.</li> | |
69 | <li>If a cache file exists, it is sent directly to the browser, bypassing the normal system execution.</li> | |
70 | <li>Security. Before the application controller is loaded, the HTTP request and any user submitted data is filtered for security.</li> | |
71 | <li>The Controller loads the model, core libraries, helpers, and any other resources needed to process the specific request.</li> | |
72 | <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 | |
73 | that on subsequent requests it can be served.</li> | |
74 | </ol> | |
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76 | ||
77 | ||
78 | ||
79 | </div> | |
80 | <!-- END CONTENT --> | |
81 | ||
82 | ||
83 | <div id="footer"> | |
84 | <p> | |
85 | Previous Topic: <a href="features.html">CodeIgniter Features</a> | |
86 | · | |
87 | <a href="#top">Top of Page</a> · | |
88 | <a href="../index.html">User Guide Home</a> · | |
89 | Next Topic: <a href="mvc.html">Model-View-Controller</a> | |
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