Checks if the class has been defined call_user_method get_class_methods Classes/Object Functions PHP Manual class_exists (PHP 4, PHP 5)class_exists — Checks if the class has been defined Description bool class_exists ( string $class_name [, bool $autoload ] ) This function checks whether or not the given class has been defined. 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. Return Values Returns TRUE if class_name is a defined class, FALSE otherwise. 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 #1 class_exists() example <?php// Check that the class exists before trying to use itif (class_exists('MyClass')) { $myclass = new MyClass();}?> Example #2 autoload parameter example <?phpfunction __autoload($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();}?> See Also function_exists() interface_exists() get_declared_classes() call_user_method get_class_methods Classes/Object Functions PHP Manual
