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class_exists
Checks if the class has been defined
(PHP 4, PHP 5)
bool class_exists ( string class_name [, bool autoload] )
Parameters
- class_name
The class name. The name is matched in a case-insensitive manner.
- autoload
Whether or not to call __autoload by default. Defaults to
TRUE.
ChangeLog
| Version | Description |
|---|---|
| 5.0.2 |
No longer returns TRUE for defined interfaces. Use
interface_exists().
|
| 5.0.0 | The autoload parameter was added. |
Examples
Example 373. class_exists() example
<?php
// Check that the class exists before trying to use it
if (class_exists('MyClass')) {
$myclass = new MyClass();
}
?>
Example 374. autoload parameter example
<?php
function __autoload($class)
{
include($class . '.php');
// Check to see whether the include declared the class
if (!class_exists($class, false)) {
trigger_error("Unable to load class: $class", E_USER_WARNING);
}
}
if (class_exists('MyClass')) {
$myclass = new MyClass();
}
?>