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<?php $input_array = [['a', 'b', 'c'], ['d', 'e', 'f']]; $input_array = array_map($input_array, 'join', ','); var_dump($input_array);
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught TypeError: array_map(): Argument #1 ($callback) must be a valid callback or null, first array member is not a valid class name or object in /in/fX44o:3 Stack trace: #0 /in/fX44o(3): array_map(Array, 'join', ',') #1 {main} thrown in /in/fX44o on line 3
Process exited with code 255.

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