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authorJoël Cox <joel@joelcox.nl>2011-10-09 18:39:39 +0200
committerJoël Cox <joel@joelcox.nl>2011-10-09 18:39:39 +0200
commitf4fb1db458fab52d0493ead52c9ea7e01206eaa7 (patch)
treec549600f342f4d3f0df75a2f2f7c265be0f1cc72 /user_guide/general/ancillary_classes.html
parentc4dd200c1155a118afa32cd91d9bd67bc243f83a (diff)
Moved tutorial to new user guide directory.
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-<title>Creating Ancillary Classes : CodeIgniter User Guide</title>
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-<a href="http://codeigniter.com/">CodeIgniter Home</a> &nbsp;&#8250;&nbsp;
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-Creating Ancillary Classes
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-<h1>Creating Ancillary Classes</h1>
-
-<p>In some cases you may want to develop classes that exist apart from your controllers but have the ability to
-utilize all of CodeIgniter's resources. This is easily possible as you'll see.</p>
-
-<h2>get_instance()</h2>
-
-
-<p><strong>Any class that you instantiate within your controller functions can access CodeIgniter's native resources</strong> simply by using the <kbd>get_instance()</kbd> function.
-This function returns the main CodeIgniter object.</p>
-
-<p>Normally, to call any of the available CodeIgniter 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>$this</kbd>, however, only works within your controllers, your models, or your views.
-If you would like to use CodeIgniter's classes from within your own custom classes you can do so as follows:</p>
-
-
-<p>First, assign the CodeIgniter object to a variable:</p>
-
-<code>$CI =& get_instance();</code>
-
-<p>Once you've assigned the object to a variable, you'll use that variable <em>instead</em> of <kbd>$this</kbd>:</p>
-
-<code>
-$CI =& get_instance();<br /><br />
-$CI->load->helper('url');<br />
-$CI->load->library('session');<br />
-$CI->config->item('base_url');<br />
-etc.
-</code>
-
-<p class="important"><strong>Note:</strong> You'll notice that the above get_instance() function is being passed by reference:
-<br /><br />
-<var>$CI =& get_instance();</var>
-<br /><br />
-This is very important. Assigning by reference allows you to use the original CodeIgniter object rather than creating a copy of it.</p>
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