PHP Function class_exists()

Syntax

class_exists ( $class_name [,$autoload] );

This function checks if the given class have been defined. Returns TRUE if class_name is a defined class, FALSE otherwise.

Parameter	Description
class_name	Required. The class name.
autoload	Optional. Whether to call __autoload or not by default.

Returns TRUE if class_name is a defined class, FALSE otherwise.

Following is the usage of this function:

<?php
if (class_exists('MyClass')) {
    $myclass = new MyClass();
}
?>