CodeIgniter Reactor / user_guide / general / environments.html

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "">
<html xmlns="" xml:lang="en" lang="en">

<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Handling Multiple Environments : CodeIgniter User Guide</title>

<style type='text/css' media='all'>@import url('../userguide.css');</style>
<link rel='stylesheet' type='text/css' media='all' href='../userguide.css' />

<script type="text/javascript" src="../nav/nav.js"></script>
<script type="text/javascript" src="../nav/prototype.lite.js"></script>
<script type="text/javascript" src="../nav/moo.fx.js"></script>
<script type="text/javascript" src="../nav/user_guide_menu.js"></script>

<meta http-equiv='expires' content='-1' />
<meta http-equiv= 'pragma' content='no-cache' />
<meta name='robots' content='all' />
<meta name='author' content='ExpressionEngine Dev Team' />
<meta name='description' content='CodeIgniter User Guide' />


<div id="nav"><div id="nav_inner"><script type="text/javascript">create_menu('../');</script></div></div>
<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>
<div id="masthead">
<table cellpadding="0" cellspacing="0" border="0" style="width:100%">
<td><h1>CodeIgniter User Guide Version 2.0.2</h1></td>
<td id="breadcrumb_right"><a href="../toc.html">Table of Contents Page</a></td>

<table cellpadding="0" cellspacing="0" border="0" style="width:100%">
<td id="breadcrumb">
<a href="">CodeIgniter Home</a> &nbsp;&#8250;&nbsp;
<a href="../index.html">User Guide Home</a> &nbsp;&#8250;&nbsp;
Handling Multiple Environments
<td id="searchbox"><form method="get" action=""><input type="hidden" name="as_sitesearch" id="as_sitesearch" value="" />Search User Guide&nbsp; <input type="text" class="input" style="width:200px;" name="q" id="q" size="31" maxlength="255" value="" />&nbsp;<input type="submit" class="submit" name="sa" value="Go" /></form></td>

<br clear="all" />

<div id="content">

<h1>Handling Multiple Environments</h1>

  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".

<h2>The ENVIRONMENT Constant</h2>

  By default, CodeIgniter comes with the environment constant set to
  '<kbd>development</kbd>'. At the top of index.php, you will see:

define('<var>ENVIRONMENT</var>', '<var>development</var>');

  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.

<h2>Effects On Default Framework Behavior</h2>

  There are some places in the CodeIgniter system where the <kbd>ENVIRONMENT</kbd>
  constant is used. This section describes how default framework behavior is

<h3>Error Reporting</h3>

  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>.

<h3>Configuration Files</h3>

  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.

<!-- END CONTENT -->

<div id="footer">
Previous Topic:&nbsp;&nbsp;<a href="managing_apps.html">Managing Applications</a>
<a href="#top">Top of Page</a>&nbsp;&nbsp;&nbsp;&middot;&nbsp;&nbsp;
<a href="../index.html">User Guide Home</a>&nbsp;&nbsp;&nbsp;&middot;&nbsp;&nbsp;
Next Topic:&nbsp;&nbsp;<a href="alternative_php.html">Alternative PHP Syntax</a>
<p><a href="">CodeIgniter</a> &nbsp;&middot;&nbsp; Copyright &#169; 2006 - 2011 &nbsp;&middot;&nbsp; <a href="">EllisLab, Inc.</a></p>