is_subclass_of Checks if the object has this class as one of its parents &reftitle.description; boolis_subclass_of mixedobject stringclass_name boolallow_string&true; Checks if the given object has the class class_name as one of its parents. &reftitle.parameters; object A class name or an object instance. No error is generated if the class does not exist. class_name The class name allow_string If this parameter set to false, string class name as object 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, belongs to a class which is a subclass of class_name, &false; otherwise. &reftitle.changelog; &Version; &Description; 5.3.9 Added allow_string parameter 5.3.7 Added support for class_name to work with interfaces 5.0.3 You may also specify the object parameter as a string (the name of the class) &reftitle.examples; ]]> &example.outputs; ]]> &example.outputs; &reftitle.notes; ¬e.uses-autoload; &reftitle.seealso; get_class get_parent_class is_a class_parents