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

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+<a href="http://www.codeigniter.com/">Code Igniter Home</a> &nbsp;&#8250;&nbsp;

+<a href="../index.html">User Guide Home</a> &nbsp;&#8250;&nbsp;

+Helper Functions

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+

+<h1>Helper Functions</h1>

+

+<p>Helpers, as the name suggests, help you with tasks.  Each helper file is simply a collection of functions in a particular

+category.  There are <dfn>URL Helpers</dfn>, that assist in creating links, there are <dfn>Form Helpers</dfn>

+that help you create form elements, <dfn>Text Helpers</dfn> perform various text formatting routines,

+<dfn>Cookie Helpers</dfn> set and read cookies, <dfn>File Helpers</dfn> help you deal with files, etc.

+</p>

+

+<p>Unlike most other systems in Code Igniter, Helpers are not written in an Object Oriented format.  They are simple, procedural functions.

+Each helper function performs one specific task, with no dependence on other functions.</p>

+

+<p>Helpers are intentionally kept very simple so that they can be used within your <strong>View Files</strong> with a minimal amount of code.  

+This is important if you intend to have designers or non-programmer will be working with your view files, since it keeps the code to a minimum.

+</p>

+

+<p>Code Igniter does not load Helper Files by default, so the first step in using 

+a Helper is to load it.  Once loaded, it becomes globally available in your <a href="../general/controllers.html">controller</a> and <a href="../general/views.html">views</a>.</p>

+

+<h2>Loading a Helper</h2>

+

+<p>Loading a helper file is quite simple using the following function:</p>

+

+<code>$this->load->helper('<var>name</var>');</code>

+

+<p>Where <var>name</var> is the file name of the helper, without the .php file extension or the "helper" part.</p>

+

+<p>For example, to load the <dfn>URL Helper</dfn> file, which is named <var>url_helper.php</var>, you would do this:</p>

+

+<code>$this->load->helper('<var>url</var>');</code>

+

+<p>A helper can be loaded anywhere within your controller functions (or even within your View files, although that's not a good practice),

+as long as you load it before you use it.  You can load your helpers in your controller constructor so that they become available

+automatically in any function, or you can load a helper in a specific function that needs it.</p>

+

+<p class="important">Note: The Helper loading function above does not return a value, so don't try to assign it to a variable.  Just use it as shown.</p>

+

+<h2>Auto-loading Helpers</h2>

+

+<p>If you find that you need a particular helper globally throughout your application, you can tell Code Igniter to auto-load it during system initialization.

+This is done by opening the <var>application/config/autoload.php</var> file and adding the helper to the autoload array.</p>

+

+

+<h2>Using a Helper</h2>

+

+<p>Once you've loaded the Helper File containing the function you intend to use, you'll call it the way you would a standard PHP function.</p>

+

+<p>For example, to create a link using the <dfn>anchor()</dfn> function in one of your view files you would do this:</p>

+

+<code>&lt;?=anchor('blog/comments', 'Click Here');?&gt;</code>

+

+<p>Where "Click Here" is the name of the link, and "blog/comments" is the URI to the controller/function you wish to link to.</p>

+

+

+<h2>Now What?</h2>

+

+<p>In the Table of Contents you'll find a list of all the available Helper Files.  Browse each one to see what they do.</p>

+

+

+</div>

+<!-- END CONTENT -->

+

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