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######################
Application Flow Chart
######################
The following graphic illustrates how data flows throughout the system:
|CodeIgniter application flow|
#. The index.php serves as the front controller, initializing the base
resources needed to run CodeIgniter.
#. The Router examines the HTTP request to determine what should be done
with it.
#. If a cache file exists, it is sent directly to the browser, bypassing
the normal system execution.
#. Security. Before the application controller is loaded, the HTTP
request and any user submitted data is filtered for security.
#. The Controller loads the model, core libraries, helpers, and any
other resources needed to process the specific request.
#. 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.
.. |CodeIgniter application flow| image:: ../images/appflowchart.gif
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