class_exists

Description

This function returns TRUE if the class given by class_name has been defined, FALSE otherwise.

class_exists() will attempt to call __autoload by default, if you don't want class_exists() to call __autoload(), you can set the parameter autoload to FALSE.

Eksempel 1. autoload parameter example <?php     function __autoload($class) {         include($class . '.php');         /* Check to see it the include defined the class */         if ( !class_exists($class, false) ) {            trigger_error("Unable to load class $class", E_USER_ERROR);         }     }          if( class_exists('MyClass') ) {         $myclass = new MyClass();     } ?>

See also get_declared_classes().