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<td><h1>CodeIgniter User Guide Version 1.7.1</h1></td>
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<a href="../index.html">User Guide Home</a> ›
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MVC
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<h1>Model-View-Controller</h1>
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<p>CodeIgniter is based on the Model-View-Controller development pattern.
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MVC is a software approach that separates application logic from presentation. In practice, it permits your web pages to contain minimal scripting since the presentation is separate from the PHP scripting.</p>
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<ul>
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<li>The <strong>Model</strong> represents your data structures. Typically your model classes will contain functions that help you
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retrieve, insert, and update information in your database.</li>
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<li>The <strong>View</strong> is the information that is being presented to a user. A View will normally be a web page, but
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in CodeIgniter, a view can also be a page fragment like a header or footer. It can also be an RSS page, or any other type of "page".</li>
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<li>The <strong>Controller</strong> serves as an <em>intermediary</em> between the Model, the View,
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and any other resources needed to process the HTTP request and generate a web page.</li>
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</ul>
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<p>CodeIgniter has a fairly loose approach to MVC since Models are not required.
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If you don't need the added separation, or find that maintaining models requires more complexity than you
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want, you can ignore them and build your application minimally using Controllers and Views. CodeIgniter also
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enables you to incorporate your own existing scripts, or even develop core libraries for the system,
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enabling you to work in a way that makes the most sense to you.</p>
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<p>
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Previous Topic: <a href="appflow.html">Application Flow Chart</a>
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<a href="#top">Top of Page</a> ·
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<a href="../index.html">User Guide Home</a> ·
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Next Topic: <a href="goals.html">Architectural Goals</a>
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<p><a href="http://codeigniter.com">CodeIgniter</a> · Copyright © 2006-2008 · <a href="http://ellislab.com/">Ellislab, Inc.</a></p>
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