is_a
(PHP 4 >= 4.2.0)
is_a -- Returns TRUE if the object is of this class or has this class as one of its parentsDescription
bool is_a ( object object, string class_name)This function returns TRUE if the object is of this class or has this class as one of its parents, FALSE otherwise.
See also get_class(), get_parent_class(), and is_subclass_of().