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<?php $array = [1, 2, 3, 4]; $callable = function(&$value) { $value = $value * 100; echo $key.PHP_EOL; }; $newArray = array_map($callable, $array); print_r($newArray);
Output for git.master, git.master_jit, rfc.property-hooks
Warning: {closure}(): Argument #1 ($value) must be passed by reference, value given in /in/DbGOh on line 9 Warning: Undefined variable $key in /in/DbGOh on line 6 Warning: {closure}(): Argument #1 ($value) must be passed by reference, value given in /in/DbGOh on line 9 Warning: Undefined variable $key in /in/DbGOh on line 6 Warning: {closure}(): Argument #1 ($value) must be passed by reference, value given in /in/DbGOh on line 9 Warning: Undefined variable $key in /in/DbGOh on line 6 Warning: {closure}(): Argument #1 ($value) must be passed by reference, value given in /in/DbGOh on line 9 Warning: Undefined variable $key in /in/DbGOh on line 6 Array ( [0] => [1] => [2] => [3] => )

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