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<?php class A {} class B extends A {} interface C {} class D implements C {} var_dump(is_subclass_of('B','A')); var_dump(is_subclass_of('A','A')); var_dump(is_subclass_of('D','C')); var_dump(is_a('B','A')); var_dump(is_a('A','A')); var_dump(is_a('D','C'));
Output for git.master, git.master_jit, rfc.property-hooks
bool(true) bool(false) bool(true) bool(false) bool(false) bool(false)

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