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+<title>Creating Libraries : CodeIgniter User Guide</title>
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+<td><h1>CodeIgniter User Guide Version 2.0.0</h1></td>
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+<a href="http://codeigniter.com/">CodeIgniter Home</a> &nbsp;&#8250;&nbsp;
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+Creating Libraries
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+
+<h1>Handling Multiple Environments</h1>
+
+<p>
+ Developers often desire different system behavior depending on whether
+ an application is running in a development or production
+ environment. For example, verbose error output is something that would
+ be useful while developing an application, but it may also pose a security issue when "live".
+</p>
+
+<h2>The ENVIRONMENT Constant</h2>
+
+<p>
+ By default, CodeIgniter comes with the environment constant set to
+ '<kbd>development</kbd>'. At the top of index.php, you will see:
+</p>
+
+<code>
+define('<var>ENVIRONMENT</var>', '<var>development</var>');
+</code>
+
+<p>
+ In addition to affecting some basic framework behavior (see the next section),
+ you may use this constant in your own development to differentiate
+ between which environment you are running in.
+</p>
+
+<h2>Effects On Default Framework Behavior</h2>
+
+<p>
+ There are some places in the CodeIgniter system where the <kbd>ENVIRONMENT</kbd>
+ constant is used. This section describes how default framework behavior is
+ affected.
+</p>
+
+<h3>Error Reporting</h3>
+
+<p>
+ Setting the <kbd>ENVIRONMENT</kbd> constant to a value of '<kbd>development</kbd>' will
+ cause all PHP errors to be rendered to the browser when they occur. Conversely,
+ setting the constant to '<kbd>production</kbd>' will disable all error output. Disabling
+ error reporting in production is a <a href="security.html">good security practice</a>.
+</p>
+
+<h3>Configuration Files</h3>
+
+<p>
+ Optionally, you can have CodeIgniter load environment-specific
+ configuration files. This may be useful for managing things like differing API keys
+ across multiple environments. This is described in more detail in the
+ environment section of the <a href="../libraries/config.html#environments">Config Class</a> documentation.
+</p>
+
+</div>
+<!-- END CONTENT -->
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