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