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authorDerek Jones <derek.jones@ellislab.com>2011-10-05 20:34:52 +0200
committerDerek Jones <derek.jones@ellislab.com>2011-10-05 20:34:52 +0200
commit8ede1a2ecbb62577afd32996956c5feaf7ddf9b6 (patch)
tree2e960ec3b416b477f40bb546371f2d486f4a22f0 /user_guide/libraries/config.html
parentd1ecd5cd4ae6ab5d37df9fbda14b93977b9e743c (diff)
replacing the old HTML user guide with a Sphinx-managed user guide
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-<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
-<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
-<head>
-
-<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
-<title>Config Class : 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' />
-
-</head>
-<body>
-
-<!-- START NAVIGATION -->
-<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%">
-<tr>
-<td><h1>CodeIgniter User Guide Version 2.0.3</h1></td>
-<td id="breadcrumb_right"><a href="../toc.html">Table of Contents Page</a></td>
-</tr>
-</table>
-</div>
-<!-- END NAVIGATION -->
-
-
-<!-- START BREADCRUMB -->
-<table cellpadding="0" cellspacing="0" border="0" style="width:100%">
-<tr>
-<td id="breadcrumb">
-<a href="http://codeigniter.com/">CodeIgniter Home</a> &nbsp;&#8250;&nbsp;
-<a href="../index.html">User Guide Home</a> &nbsp;&#8250;&nbsp;
-Config Class
-</td>
-<td id="searchbox"><form method="get" action="http://www.google.com/search"><input type="hidden" name="as_sitesearch" id="as_sitesearch" value="codeigniter.com/user_guide/" />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>
-</tr>
-</table>
-<!-- END BREADCRUMB -->
-
-<br clear="all" />
-
-
-<!-- START CONTENT -->
-<div id="content">
-
-
-<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 $config array index you want to change, and <var>item_value</var> is its value.</p>
-
-<a name="environments"></a>
-<h2>Environments</h2>
-
-<p>
- You may load different configuration files depending on the current environment.
- The <kbd>ENVIRONMENT</kbd> constant is defined in index.php, and is described
- in detail in the <a href="../general/environments.html">Handling Environments</a>
- section.
-</p>
-
-<p>
- To create an environment-specific configuration file,
- create or copy a configuration file in application/config/{ENVIRONMENT}/{FILENAME}.php
-</p>
-
-<p>For example, to create a production-only config.php, you would:</p>
-
-<ol>
- <li>Create the directory application/config/production/</li>
- <li>Copy your existing config.php into the above directory</li>
- <li>Edit application/config/production/config.php so it contains your production settings</li>
-</ol>
-
-<p>
- When you set the <kbd>ENVIRONMENT</kbd> constant to 'production', the settings
- for your new production-only config.php will be loaded.
-</p>
-
-<p>You can place the following configuration files in environment-specific folders:</p>
-
-<ul>
-<li>Default CodeIgniter configuration files</li>
-<li>Your own custom configuration files</li>
-</ul>
-
-<p><strong>Note:</strong> CodeIgniter always tries to load the configuration files for the current environment first. If the file does not exist, the global config file (i.e., the one in <samp>application/config/</samp>) is loaded. This means you are not obligated to place <strong>all</strong> of your configuration files in an environment folder &minus; only the files that change per environment.</p>
-
-<h2>Helper Functions</h2>
-
-<p>The config class has the following helper functions:</p>
-
-<h2>$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>$this->config->base_url();</h2>
-<p>This function retrieves the URL to your site, plus an optional path such as to a stylesheet or image.</p>
-
-<p>The two functions above are normally accessed via the corresponding functions in the <a href="../helpers/url_helper.html">URL Helper.</a></p>
-
-<h2>$this->config->system_url();</h2>
-<p>This function retrieves the URL to your <dfn>system folder</dfn>.</p>
-
-
-</div>
-<!-- END CONTENT -->
-
-
-<div id="footer">
-<p>
-Previous Topic:&nbsp;&nbsp;<a href="calendar.html">Calendaring Class</a>
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