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<?php $a = [3, [4, 6]]; $b = [3, [4, 5]]; $key = key(array_diff_assoc(array_merge(...$a), array_merge(...$b))); var_dump($key);
Output for git.master_jit, git.master, rfc.property-hooks
Fatal error: Uncaught TypeError: array_merge(): Argument #1 must be of type array, int given in /in/12QrO:6 Stack trace: #0 /in/12QrO(6): array_merge(3, Array) #1 {main} thrown in /in/12QrO on line 6
Process exited with code 255.

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