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  <div class="section" id="handling-multiple-environments">
<h1>Handling Multiple Environments<a class="headerlink" href="#handling-multiple-environments" title="Permalink to this headline">¶</a></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>
<div class="section" id="the-environment-constant">
<h2>The ENVIRONMENT Constant<a class="headerlink" href="#the-environment-constant" title="Permalink to this headline">¶</a></h2>
<p>By default, CodeIgniter comes with the environment constant set to use
the value provided in <code class="docutils literal"><span class="pre">$_SERVER['CI_ENV']</span></code>, otherwise defaults to
‘development’. At the top of index.php, you will see:</p>
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nb">define</span><span class="p">(</span><span class="s1">&#39;ENVIRONMENT&#39;</span><span class="p">,</span> <span class="nb">isset</span><span class="p">(</span><span class="nv">$_SERVER</span><span class="p">[</span><span class="s1">&#39;CI_ENV&#39;</span><span class="p">])</span> <span class="o">?</span> <span class="nv">$_SERVER</span><span class="p">[</span><span class="s1">&#39;CI_ENV&#39;</span><span class="p">]</span> <span class="o">:</span> <span class="s1">&#39;development&#39;</span><span class="p">);</span>
</pre></div>
</div>
<p>This server variable can be set in your .htaccess file, or Apache
config using <a class="reference external" href="https://httpd.apache.org/docs/2.2/mod/mod_env.html#setenv">SetEnv</a>.
Alternative methods are available for nginx and other servers, or you can
remove this logic entirely and set the constant based on the server’s IP address.</p>
<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>
</div>
<div class="section" id="effects-on-default-framework-behavior">
<h2>Effects On Default Framework Behavior<a class="headerlink" href="#effects-on-default-framework-behavior" title="Permalink to this headline">¶</a></h2>
<p>There are some places in the CodeIgniter system where the ENVIRONMENT
constant is used. This section describes how default framework behavior
is affected.</p>
<div class="section" id="error-reporting">
<h3>Error Reporting<a class="headerlink" href="#error-reporting" title="Permalink to this headline">¶</a></h3>
<p>Setting the ENVIRONMENT constant to a value of ‘development’ will cause
all PHP errors to be rendered to the browser when they occur.
Conversely, setting the constant to ‘production’ will disable all error
output. Disabling error reporting in production is a <a class="reference internal" href="security.html"><span class="doc">good security
practice</span></a>.</p>
</div>
<div class="section" id="configuration-files">
<h3>Configuration Files<a class="headerlink" href="#configuration-files" title="Permalink to this headline">¶</a></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 class="reference internal" href="../libraries/config.html"><span class="doc">Config Class</span></a> documentation.</p>
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