ReflectionClass::isSubclassOf Checks if a subclass &reftitle.description; public boolReflectionClass::isSubclassOf ReflectionClassstringclass Checks if the class is a subclass of a specified class or implements a specified interface. &reftitle.parameters; class Either the name of the class as string or a ReflectionClass object of the class to check against. &reftitle.returnvalues; Returns &true; if the class is a subclass of the specified class or interface, or &false; otherwise. &reftitle.seealso; ReflectionClass::isInterface ReflectionClass::implementsInterface is_subclass_of get_parent_class