126 行
无行尾
4.8 KiB
HTML
126 行
无行尾
4.8 KiB
HTML
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
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<title>Creating Libraries : CodeIgniter User Guide</title>
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<meta name='author' content='ExpressionEngine Dev Team' />
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<meta name='description' content='CodeIgniter User Guide' />
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<div id="nav"><div id="nav_inner"><script type="text/javascript">create_menu('../');</script></div></div>
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<div id="nav2"><a name="top"></a><a href="javascript:void(0);" onclick="myHeight.toggle();"><img src="../images/nav_toggle_darker.jpg" width="154" height="43" border="0" title="Toggle Table of Contents" alt="Toggle Table of Contents" /></a></div>
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<div id="masthead">
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<table cellpadding="0" cellspacing="0" border="0" style="width:100%">
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<tr>
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<td><h1>CodeIgniter User Guide Version 2.0.0</h1></td>
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<td id="breadcrumb_right"><a href="../toc.html">Table of Contents Page</a></td>
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</tr>
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<tr>
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<td id="breadcrumb">
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<a href="http://codeigniter.com/">CodeIgniter Home</a> ›
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<a href="../index.html">User Guide Home</a> ›
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Creating Libraries
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</td>
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<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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</table>
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<br clear="all" />
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<!-- START CONTENT -->
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<div id="content">
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<h1>Handling Multiple Environments</h1>
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<p>
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Developers often desire different system behavior depending on whether
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an application is running in a development or production
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environment. For example, verbose error output is something that would
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be useful while developing an application, but it may also pose a security issue when "live".
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</p>
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<h2>The ENVIRONMENT Constant</h2>
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<p>
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By default, CodeIgniter comes with the environment constant set to
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'<kbd>development</kbd>'. At the top of index.php, you will see:
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</p>
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<code>
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define('<var>ENVIRONMENT</var>', '<var>development</var>');
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</code>
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<p>
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In addition to affecting some basic framework behavior (see the next section),
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you may use this constant in your own development to differentiate
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between which environment you are running in.
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</p>
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<h2>Effects On Default Framework Behavior</h2>
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<p>
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There are some places in the CodeIgniter system where the <kbd>ENVIRONMENT</kbd>
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constant is used. This section describes how default framework behavior is
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affected.
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</p>
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<h3>Error Reporting</h3>
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<p>
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Setting the <kbd>ENVIRONMENT</kbd> constant to a value of '<kbd>development</kbd>' will
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cause all PHP errors to be rendered to the browser when they occur. Conversely,
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setting the constant to '<kbd>production</kbd>' will disable all error output. Disabling
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error reporting in production is a <a href="security.html">good security practice</a>.
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</p>
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<h3>Configuration Files</h3>
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<p>
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Optionally, you can have CodeIgniter load environment-specific
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configuration files. This may be useful for managing things like differing API keys
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across multiple environments. This is described in more detail in the
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environment section of the <a href="../libraries/config.html#environments">Config Class</a> documentation.
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</p>
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</div>
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<!-- END CONTENT -->
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<div id="footer">
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<p>
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Previous Topic: <a href="libraries.html">Using CodeIgniter Libraries</a>
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·
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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="drivers.html">Using CodeIgniter Drivers</a>
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</p>
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<p><a href="http://codeigniter.com">CodeIgniter</a> · Copyright © 2006 - 2011 · <a href="http://ellislab.com/">EllisLab, Inc.</a></p>
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