is_a Checks if the object is of this class or has this class as one of its parents &reftitle.description; boolis_a objectobject stringclass_name Checks if the given object is of this class or has this class as one of its parents. &reftitle.parameters; object The tested object class_name The class name &reftitle.returnvalues; Returns &true; if the object is of this class or has this class as one of its parents, &false; otherwise. &reftitle.changelog; &Version; &Description; 5.3.0 This function is no longer deprecated, and will therefore no longer throw E_STRICT warnings. 5.0.0 This function became deprecated in favour of the instanceof operator. Calling this function will result in an E_STRICT warning. &reftitle.examples; <function>is_a</function> example ]]> Using the <emphasis>instanceof</emphasis> operator in PHP 5 ]]> &reftitle.seealso; get_class get_parent_class is_subclass_of