class_exists Checks if the class has been defined &reftitle.description; boolclass_exists stringclass_name boolautoload&true; This function checks whether or not the given class has been defined. &reftitle.parameters; class_name The class name. The name is matched in a case-insensitive manner. autoload Whether or not to call &link.autoload; by default. &reftitle.returnvalues; Returns &true; if class_name is a defined class, &false; otherwise. &reftitle.examples; ]]> ]]> &reftitle.seealso; function_exists interface_exists get_declared_classes