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<?php $array = [1, 2, 3, 4]; $callable = function($value, $key, array $output) { $output[$key] = $value * 100; }; $output = []; array_map($callable, $array, array_keys($array), $output); print_r($output);
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught TypeError: {closure}(): Argument #3 ($output) must be of type array, null given in /in/lA6ns:4 Stack trace: #0 [internal function]: {closure}(1, 0, NULL) #1 /in/lA6ns(9): array_map(Object(Closure), Array, Array, Array) #2 {main} thrown in /in/lA6ns on line 4
Process exited with code 255.

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