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<?php $a = ['A', 'Abc', 'def']; var_dump(array_combine(array_walk($a, 'strtolower'), $a));
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught ArgumentCountError: strtolower() expects exactly 1 argument, 2 given in /in/LgplG:5 Stack trace: #0 [internal function]: strtolower('A', 0) #1 /in/LgplG(5): array_walk(Array, 'strtolower') #2 {main} thrown in /in/LgplG on line 5
Process exited with code 255.

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