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<?php $a = array(1, 2, 3, 4, 5); $b = array_keys(function($i) { return $a[$i]*2; }); var_dump($b);
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught TypeError: array_keys(): Argument #1 ($array) must be of type array, Closure given in /in/Zhtn6:5 Stack trace: #0 /in/Zhtn6(5): array_keys(Object(Closure)) #1 {main} thrown in /in/Zhtn6 on line 5
Process exited with code 255.

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