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<?php interface A {} class B implements A {} class C extends B {} $b = new B; var_dump(is_a($b, 'A')); $c = new C; var_dump(is_a($c, 'A')); var_dump(is_a($c, 'B')); var_dump(is_a($c, 'C')); var_dump(is_a('C', 'A', true)); var_dump(is_a('C', 'B', true)); var_dump(is_a('C', 'C', true));
Output for git.master, git.master_jit, rfc.property-hooks
bool(true) bool(true) bool(true) bool(true) bool(true) bool(true) bool(true)

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