is_a Checks whether the object is of a given type or subtype &reftitle.description; boolis_a mixedobject_or_class stringclass boolallow_string&false; Checks if the given object_or_class is of this object type or has this class as one of its parents. &reftitle.parameters; object_or_class A class name or an object instance. class The class or interface 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; Returns &true; if the object is of this class or has this class as one of its parents, &false; otherwise. &reftitle.examples; ]]> ]]> &reftitle.seealso; get_class get_parent_class is_subclass_of