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<?php $a = array_key( array('photo' => 'foo.jpeg', 'audio' => 'bar.mp3') ); $b = array('photo', 'audio', 'video'); var_dump(array_values(array_merge(array_diff($b, $a), array_diff($a, $b))));
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught Error: Call to undefined function array_key() in /in/ahrr9:2 Stack trace: #0 {main} thrown in /in/ahrr9 on line 2
Process exited with code 255.

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