is_subclass_ofDescriptionis_subclass_of() is used to determine whether the class from which a given object is instantiated is a subclass of the given class. ExampleExample 108. 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 = 2; function jinrikisha () { $this->passenger_num = '1 to 2'; $this->power_source = 'human/pulled'; $this->travel_medium = 'land/roads'; } } $my_jinrikisha = new jinrikisha (); $class = get_class ($my_jinrikisha); $parent_class = 'vehicle'; print "Object \$my_jinrikisha is an instance of class <i>$class</i>.\n"; $qualifier = is_subclass_of ($my_jinrikisha, $parent_class) ? 'is' : 'is not'; print "Class <i>$class</i> $qualifier a subclass of class <i>$parent_class</i>.";
PHP Functions Essential Reference. Copyright © 2002 by New Riders Publishing
(Authors: Zak Greant, Graeme Merrall, Torben Wilson, Brett Michlitsch).
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