is_subclass_of Checks if the object has this class as one of its parents or implements it &reftitle.description; boolis_subclass_of mixedobject_or_class stringclass boolallow_string&true; Checks if the given object_or_class has the class class as one of its parents or implements it. &reftitle.parameters; object_or_class A class name or an object instance. No error is generated if the class does not exist. class The class name allow_string If this parameter set to false, string class name as object_or_class is not allowed. This also prevents from calling autoloader if the class doesn't exist. &reftitle.returnvalues; This function returns &true; if the object object_or_class, belongs to a class which is a subclass of class, &false; otherwise. &reftitle.examples; ]]> &example.outputs; ]]> &example.outputs; &reftitle.notes; ¬e.uses-autoload; &reftitle.seealso; get_class get_parent_class is_a class_parents