223 lines
9.8 KiB
HTML
223 lines
9.8 KiB
HTML
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<title>Config Class : CodeIgniter User Guide</title>
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<td><h1>CodeIgniter User Guide Version 2.1.4</h1></td>
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<td id="breadcrumb_right"><a href="../toc.html">Table of Contents Page</a></td>
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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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Config Class
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<h1>Config Class</h1>
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<p>The Config class provides a means to retrieve configuration preferences. These preferences can
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come from the default config file (<samp>application/config/config.php</samp>) or from your own custom config files.</p>
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<p class="important"><strong>Note:</strong> This class is initialized automatically by the system so there is no need to do it manually.</p>
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<h2>Anatomy of a Config File</h2>
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<p>By default, CodeIgniter has one primary config file, located at <samp>application/config/config.php</samp>. If you open the file using
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your text editor you'll see that config items are stored in an array called <var>$config</var>.</p>
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<p>You can add your own config items to
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this file, or if you prefer to keep your configuration items separate (assuming you even need config items),
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simply create your own file and save it in <dfn>config</dfn> folder.</p>
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<p><strong>Note:</strong> If you do create your own config files use the same format as the primary one, storing your items in
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an array called <var>$config</var>. CodeIgniter will intelligently manage these files so there will be no conflict even though
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the array has the same name (assuming an array index is not named the same as another).</p>
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<h2>Loading a Config File</h2>
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<p><strong>Note:</strong> CodeIgniter automatically loads the primary config file (<samp>application/config/config.php</samp>),
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so you will only need to load a config file if you have created your own.</p>
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<p>There are two ways to load a config file:</p>
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<ol><li><strong>Manual Loading</strong>
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<p>To load one of your custom config files you will use the following function within the <a href="../general/controllers.html">controller</a> that needs it:</p>
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<code>$this->config->load('<var>filename</var>');</code>
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<p>Where <var>filename</var> is the name of your config file, without the .php file extension.</p>
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<p>If you need to load multiple config files normally they will be merged into one master config array. Name collisions can occur, however, if
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you have identically named array indexes in different config files. To avoid collisions you can set the second parameter to <kbd>TRUE</kbd>
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and each config file will be stored in an array index corresponding to the name of the config file. Example:</p>
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<code>
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// Stored in an array with this prototype: $this->config['blog_settings'] = $config<br />
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$this->config->load('<var>blog_settings</var>', <kbd>TRUE</kbd>);</code>
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<p>Please see the section entitled <dfn>Fetching Config Items</dfn> below to learn how to retrieve config items set this way.</p>
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<p>The third parameter allows you to suppress errors in the event that a config file does not exist:</p>
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<code>$this->config->load('<var>blog_settings</var>', <dfn>FALSE</dfn>, <kbd>TRUE</kbd>);</code>
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</li>
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<li><strong>Auto-loading</strong>
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<p>If you find that you need a particular config file globally, you can have it loaded automatically by the system. To do this,
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open the <strong>autoload.php</strong> file, located at <samp>application/config/autoload.php</samp>, and add your config file as
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indicated in the file.</p>
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</li>
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</ol>
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<h2>Fetching Config Items</h2>
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<p>To retrieve an item from your config file, use the following function:</p>
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<code>$this->config->item('<var>item name</var>');</code>
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<p>Where <var>item name</var> is the $config array index you want to retrieve. For example, to fetch your language choice you'll do this:</p>
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<code>$lang = $this->config->item('language');</code>
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<p>The function returns FALSE (boolean) if the item you are trying to fetch does not exist.</p>
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<p>If you are using the second parameter of the <kbd>$this->config->load</kbd> function in order to assign your config items to a specific index
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you can retrieve it by specifying the index name in the second parameter of the <kbd>$this->config->item()</kbd> function. Example:</p>
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<code>
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// Loads a config file named blog_settings.php and assigns it to an index named "blog_settings"<br />
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$this->config->load('<var>blog_settings</var>', <kbd>TRUE</kbd>);<br /><br />
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// Retrieve a config item named site_name contained within the blog_settings array<br />
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$site_name = $this->config->item('<dfn>site_name</dfn>', '<var>blog_settings</var>');<br /><br />
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// An alternate way to specify the same item:<br />
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$blog_config = $this->config->item('<var>blog_settings</var>');<br />
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$site_name = $blog_config['site_name'];</code>
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<h2>Setting a Config Item</h2>
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<p>If you would like to dynamically set a config item or change an existing one, you can do so using:</p>
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<code>$this->config->set_item('<var>item_name</var>', '<var>item_value</var>');</code>
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<p>Where <var>item_name</var> is the $config array index you want to change, and <var>item_value</var> is its value.</p>
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<a name="environments"></a>
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<h2>Environments</h2>
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<p>
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You may load different configuration files depending on the current environment.
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The <kbd>ENVIRONMENT</kbd> constant is defined in index.php, and is described
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in detail in the <a href="../general/environments.html">Handling Environments</a>
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section.
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</p>
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<p>
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To create an environment-specific configuration file,
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create or copy a configuration file in application/config/{ENVIRONMENT}/{FILENAME}.php
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</p>
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<p>For example, to create a production-only config.php, you would:</p>
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<ol>
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<li>Create the directory application/config/production/</li>
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<li>Copy your existing config.php into the above directory</li>
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<li>Edit application/config/production/config.php so it contains your production settings</li>
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</ol>
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<p>
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When you set the <kbd>ENVIRONMENT</kbd> constant to 'production', the settings
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for your new production-only config.php will be loaded.
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</p>
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<p>You can place the following configuration files in environment-specific folders:</p>
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<ul>
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<li>Default CodeIgniter configuration files</li>
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<li>Your own custom configuration files</li>
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</ul>
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<p><strong>Note:</strong> CodeIgniter always tries to load the configuration files for the current environment first. If the file does not exist, the global config file (i.e., the one in <samp>application/config/</samp>) is loaded. This means you are not obligated to place <strong>all</strong> of your configuration files in an environment folder − only the files that change per environment.</p>
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<h2>Helper Functions</h2>
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<p>The config class has the following helper functions:</p>
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<h2>$this->config->site_url();</h2>
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<p>This function retrieves the URL to your site, along with the "index" value you've specified in the config file.</p>
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<h2>$this->config->base_url();</h2>
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<p>This function retrieves the URL to your site, plus an optional path such as to a stylesheet or image.</p>
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<p>The two functions above are normally accessed via the corresponding functions in the <a href="../helpers/url_helper.html">URL Helper.</a></p>
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<h2>$this->config->system_url();</h2>
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<p>This function retrieves the URL to your <dfn>system folder</dfn>.</p>
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</div>
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<!-- END CONTENT -->
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<p>
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Previous Topic: <a href="calendar.html">Calendaring Class</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="../database/index.html">Database Class</a>
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</p>
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<p><a href="http://codeigniter.com">CodeIgniter</a> · Copyright © 2006 - 2012 · <a href="http://ellislab.com/">EllisLab, Inc.</a></p>
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