<?php interface Thing { } class Foo implements Thing { } class Bar extends Foo { } class Zulu { } var_dump( is_subclass_of('Foo', 'Thing'), is_a('Foo', 'Thing'), is_subclass_of('Bar', 'Thing'), is_a('Bar', 'Thing'), is_subclass_of('Zulu', 'Thing'), is_a('Zulu', 'Thing') );
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