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

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