Initial Import
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+<td><h1>Code Igniter User Guide Version 1.4.0</h1></td>

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+Creating Libraries

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+

+<h1>Creating Libraries</h1>

+

+<p>When we use the term "Libraries" we are normally referring to the classes that are located in the <kbd>libraries</kbd>

+directory and described in the Class Reference of this user guide.  In this case, however, we will instead describe how you can create your own libraries within 

+your <dfn>application</dfn> directory in order to maintain separation between your local resources and the global framework resources.</p>

+

+<h2>Storage</h2>

+

+<p>In order for your libraries to be stored in your <kbd>application</kbd> folder you will need to create two directories in which to store them:</p>

+

+<ul>

+<li>application/<dfn>init</dfn></li>

+<li>application/<dfn>libraries</dfn></li>

+</ul>

+

+

+<h2>Anatomy of a Library</h2>

+

+<p>A class library consists of two components:</p>

+

+<ol>

+<li>An <kbd>init</kbd> file.</li>

+<li>A <kbd>class</kbd> file.</li>

+</ol>

+

+<h2>The Init File</h2>

+

+<p>An <kbd>init</kbd> file a small initialization file corresponding to each of your classes.  The purpose of this file is to 

+instantiate a particular class. Each init file must be named identically to your class file name, adding the "init_" prefix.  For example, if your

+class is named <dfn>myclass.php</dfn> your init file will be named:</p>

+

+<code>init_myclass.php</code>

+

+<p>Within your init file you will place your initialization code.  Here's an example of such code, using an imaginary class named <kbd>Myclass</kbd>:</p>

+

+

+<code>&lt;?php  if (!defined('BASEPATH')) exit('No direct script access allowed');<br />

+<br />

+if ( ! class_exists('<kbd>Myclass</kbd>'))<br />

+{<br />

+&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;require_once(APPPATH.'libraries/<kbd>Myclass</kbd>'.EXT);<br />

+}<br />

+<br />

+$obj =& get_instance();<br />

+$obj-><kbd>myclass</kbd> = new <kbd>Myclass();</kbd><br />

+$obj->ci_is_loaded[] = '<kbd>myclass</kbd>';<br />

+<br />

+?&gt;</code>

+

+<h2>The Class File</h2>

+

+<p>Your class file itself will be placed inside your <dfn>libraries</dfn> directory:</p>

+

+<code>application/libraries/<dfn>myclass.php</dfn></code>

+

+<p>The class will have this basic prototype:</p>

+

+<code>&lt;?php  if (!defined('BASEPATH')) exit('No direct script access allowed');<br />

+<br />

+class Myclass {<br />

+<br />

+}<br />

+?&gt;</code>

+

+

+<h2>Naming Conventions</h2>

+

+<ul>

+<li>All file names must be in lowercase:  myclass.php and init_myclass.php</li>

+<li>Class names must be capitalize:  class Myclass</li>

+</ul>

+

+

+<h2>Using Your Class</h2>

+

+<p>From within any of your <a href="controllers.html">Controller</a> classes you can initialize your class using the standard:</p>

+

+<code>$this->load->library('<kbd>myclass</kbd>');</code>

+

+<p>Once loaded you can access your class using:</p>

+

+<code>$this-><kbd>myclass</kbd>->function();</code>

+

+<p>Note: In your init file you can define the object variable name.</p>

+

+

+<h2>Passing Parameters Your Class</h2>

+

+<p>In the library loading function you can pass data via the second parameter and it will be available to your initialization file:</p>

+

+<code>

+$params = array('type' => 'large', 'color' => 'red');<br />

+<br />

+$this->load->library('myclass', <kbd>$params</kbd>);</code>

+

+<p>Parameters will be accessible using a variable called <kbd>$params</kbd>.  By default this variable is set to FALSE.</p>

+

+

+<h2>Utilizing Code Igniter Resources within Your Library</h2>

+

+

+<p>To access Code Igniter's native resources within your library use the <kbd>get_instance()</kbd> function.

+This function returns the Code Igniter super object.</p>

+

+<p>Normally, to call any of the available Code Igniter functions requires you to use the <kbd>$this</kbd> construct:</p>

+

+<code>

+<strong>$this</strong>->load->helper('url');<br />

+<strong>$this</strong>->load->library('session');<br />

+<strong>$this</strong>->config->item('base_url');<br />

+etc.

+</code>

+

+<p><kbd>$this</kbd>, however, only works directly within your controllers, your models, or your views.  

+If you would like to use Code Igniter's classes from within your own custom classes you can do so as follows:</p>

+

+

+<p>First, assign the Code Igniter object to a variable:</p>

+

+<code>$obj =& get_instance();</code>

+

+<p>Once you've assigned the object to a variable, you'll use that variable <em>instead</em> of <kbd>$this</kbd>:</p>

+

+<code>

+$obj =& get_instance();<br /><br />

+$obj->load->helper('url');<br />

+$obj->load->library('session');<br />

+$obj->config->item('base_url');<br />

+etc.

+</code>

+

+<p class="important"><strong>Note:</strong> You'll notice that the above get_instance() function is being passed by reference:

+<br /><br />

+<var>$obj =& get_instance();</var>

+<br /><br />

+<kbd>This is very important.</kbd> Assigning by reference allows you to use the original Code Igniter object rather than creating a copy of it.</p>

+

+

+

+

+

+

+

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+<p>

+Previous Topic:&nbsp;&nbsp;<a href="libraries.html">Using Libraries</a>

+&nbsp;&nbsp;&nbsp;&middot;&nbsp;&nbsp;

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