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<?php interface A {} interface B {} interface C extends A, B {} class Foo implements C {} var_dump(instance_of(new Foo, 'A'));
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught Error: Call to undefined function instance_of() in /in/kQ6NH:11 Stack trace: #0 {main} thrown in /in/kQ6NH on line 11
Process exited with code 255.

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