diff options
| author | admin <devnull@localhost> | 2006-09-28 09:15:05 +0200 |
|---|---|---|
| committer | admin <devnull@localhost> | 2006-09-28 09:15:05 +0200 |
| commit | e1bf94291750a592b1a9749240f08a3d5edb7d39 (patch) | |
| tree | 02408936d899c5e2fab78645cfd928796df24f74 /user_guide/general/creating_libraries.html | |
| parent | 33de9a144aad28763405f8ae2d5c59df5e929b4f (diff) | |
Diffstat (limited to 'user_guide/general/creating_libraries.html')
| -rw-r--r-- | user_guide/general/creating_libraries.html | 75 |
1 files changed, 59 insertions, 16 deletions
diff --git a/user_guide/general/creating_libraries.html b/user_guide/general/creating_libraries.html index a2d40f95d..d84cf2e23 100644 --- a/user_guide/general/creating_libraries.html +++ b/user_guide/general/creating_libraries.html @@ -78,7 +78,7 @@ to an existing library. Or you can even replace native libraries just by placing <li>You can replace native libraries.</li>
</ul>
-
+<p>The page below explains these three concepts in detail.</p>
<h2>Storage</h2>
@@ -97,11 +97,11 @@ they are initialized.</p> <h2>The Class File</h2>
-<p>Classes should have this basic prototype (Note: We are using the name <kbd>Myclass</kbd> purely as an example):</p>
+<p>Classes should have this basic prototype (Note: We are using the name <kbd>Someclass</kbd> purely as an example):</p>
-<code><?php if (!defined('BASEPATH')) exit('No direct script access allowed');<br />
+<code><?php if (!defined('BASEPATH')) exit('No direct script access allowed');
<br /><br />
-class Myclass {<br />
+class Someclass {<br />
<br />
function some_function()<br />
{<br />
@@ -114,14 +114,14 @@ class Myclass {<br /> <p>From within any of your <a href="controllers.html">Controller</a> functions you can initialize your class using the standard:</p>
-<code>$this->load->library('<kbd>Mclass</kbd>');</code>
+<code>$this->load->library('<kbd>someclass</kbd>');</code>
-<p>Where <em>Myclass</em> is the file name, without the ".php" file extension. You can submit the file name capitalized or lower case.
+<p>Where <em>someclass</em> is the file name, without the ".php" file extension. You can submit the file name capitalized or lower case.
Code Igniter doesn't care.</p>
-<p>Once loaded you can access your class using:</p>
+<p>Once loaded you can access your class using the <kbd>lower case</kbd> version:</p>
-<code>$this-><kbd>myclass</kbd>->some_function(); // Object instances will always be lower case
+<code>$this-><kbd>someclass</kbd>->some_function(); // Object instances will always be lower case
</code>
@@ -134,26 +134,24 @@ constructor:</p> <code>
$params = array('type' => 'large', 'color' => 'red');<br />
<br />
-$this->load->library('Myclass', <kbd>$params</kbd>);</code>
+$this->load->library('Someclass', <kbd>$params</kbd>);</code>
<p>If you use this feature you must set up your class constructor to expect data:</p>
<code><?php if (!defined('BASEPATH')) exit('No direct script access allowed');<br />
<br />
-// Initialize the class<br />
-$obj =& get_instance();<br />
-$obj->init_class('Myclass');
-<br /><br />
-class Myclass {<br />
+class Someclass {<br />
<br />
- function Myclass($params)<br />
+ function Someclass($params)<br />
{<br />
// Do something with $params<br />
}<br />
}<br /><br />
?></code>
-<p>You can also pass parameters stored in a config file. Simply create a config file named identically to the class filename.</p>
+<p class="important">You can also pass parameters stored in a config file. Simply create a config file named identically to the class <kbd>file name</kbd>
+and store it in your <dfn>application/config/</dfn> folder. Note that if you dynamically pass parameters as described above,
+the config file option will not be available.</p>
@@ -201,8 +199,53 @@ etc. <kbd>This is very important.</kbd> Assigning by reference allows you to use the original Code Igniter object rather than creating a copy of it.</p>
+<h2>Replacing Native Libraries with Your Versions</h2>
+
+<p>Simply by naming your class files identically to a native library will cause Code Igniter to use it instead of the native one. To use this
+feature you must name the file and the class declaration exactly the same as the native library. For example, to replace the native <kbd>Email</kbd> library
+you'll create a file named <dfn>application/libraries/email.php</dfn>, and declare your class with:</p>
+
+<code>
+class CI_Email {<br /><br />
+
+}</code>
+
+<p>Note that most native classes are prefixed with <kbd>CI_</kbd>.</p>
+
+<p>To load your library you'll see the standard loading function:</p>
+
+<code>$this->load->library('<kbd>email</kbd>');</code>
+
+
+
+<h2>Extending Native Libraries</h2>
+
+<p>If all you need to do is add some functionality to an existing library - perhaps add a function or two - then
+it's overkill to replace the entire library with your version. In this case it's better to simply extend the class.</p>
+
+<p>Extending a class is identical to replacing a class with one exception: The class declaration must extend the parent class
+and your new class must be prefixed with <kbd>MY_</kbd>. For example, to extend the native <kbd>Email</kbd> class
+you'll create a file named <dfn>application/libraries/email.php</dfn>, and declare your class with:</p>
+
+<code>
+class MY_Email extends CI_Email {<br /><br />
+
+}</code>
+
+<p>Note: If you need to use a constructor in your class make sure you extend the parent constructor:</p>
+
+<code>
+class MY_Email extends CI_Email {<br />
+<br />
+ function My_Email()<br />
+ {<br />
+ parent::CI_Email();<br />
+ }<br />
+}</code>
+<p class="important"><strong>Important:</strong> To tell Code Igniter to load your sub-class you MUST include <kbd>my_</kbd> in the loading function:</p>
+<code>$this->load->library('<kbd>my_</kbd>email');</code>
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