   #PHP Manual Class/Object Functions is_a method_exists

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                                is_subclass_of

   (PHP 4 )
   is_subclass_of --  Returns TRUE if the object has this class as one of
   its parents

Description

   bool is_subclass_of ( object object, string class_name)

   This function returns TRUE if the object object, belongs to a class
   which is a subclass of class_name, FALSE otherwise.

   See also get_class(), get_parent_class() and is_a().
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