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<?php $input_array = [['a', 'b', 'c'], ['d', 'e', 'f']]; array_walk($input_array, 'join', ','); var_dump($input_array);
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught ArgumentCountError: join() expects at most 2 arguments, 3 given in /in/uhJ8M:3 Stack trace: #0 [internal function]: join(Array, 0, ',') #1 /in/uhJ8M(3): array_walk(Array, 'join', ',') #2 {main} thrown in /in/uhJ8M on line 3
Process exited with code 255.

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