PHP Functions Essential Reference

is_subclass_of

bool is_subclass_of(object obj, string parent_class_name) 

obj	Object to test for being a subclass of parent_class_name
parent_class_name	Name of the class to test with

Finds whether an object’s class is a subclass of a given class.

Returns:

TRUE if the given object is a subclass of the given class; FALSE for all other cases

Description:

is_subclass_of() is used to determine whether the class from which a given object is instantiated is a subclass of the given class.

Availability:

UNIX, Windows

Version:

4.0b4+

See also:

get_parent_class() 

Example:

Determine whether a class is a subclass of another class

class vehicle { var $passenger_num; var $power_source; var $travel_medium; } class jinrikisha extends vehicle { var $wheels ...