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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">$_SERVER['CI_ENV']</span></code>, otherwise defaults to |
| ‘development’. At the top of index.php, you will see:</p> |
| <div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nb">define</span><span class="p">(</span><span class="s1">'ENVIRONMENT'</span><span class="p">,</span> <span class="nb">isset</span><span class="p">(</span><span class="nv">$_SERVER</span><span class="p">[</span><span class="s1">'CI_ENV'</span><span class="p">])</span> <span class="o">?</span> <span class="nv">$_SERVER</span><span class="p">[</span><span class="s1">'CI_ENV'</span><span class="p">]</span> <span class="o">:</span> <span class="s1">'development'</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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