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<?php $array = array(1, 1, 2, 3, 5); foreach ($array as &$value) { $value *= $value; unset($value); } var_dump($array); $value = 42; var_dump($array); array_walk($array, function(&$value, &$key) { $value *= $value; }); var_dump($array);
Output for git.master, git.master_jit, rfc.property-hooks
array(5) { [0]=> int(1) [1]=> int(1) [2]=> int(4) [3]=> int(9) [4]=> int(25) } array(5) { [0]=> int(1) [1]=> int(1) [2]=> int(4) [3]=> int(9) [4]=> int(25) } Warning: {closure}(): Argument #2 ($key) must be passed by reference, value given in /in/YXQAi on line 18 Warning: {closure}(): Argument #2 ($key) must be passed by reference, value given in /in/YXQAi on line 18 Warning: {closure}(): Argument #2 ($key) must be passed by reference, value given in /in/YXQAi on line 18 Warning: {closure}(): Argument #2 ($key) must be passed by reference, value given in /in/YXQAi on line 18 Warning: {closure}(): Argument #2 ($key) must be passed by reference, value given in /in/YXQAi on line 18 array(5) { [0]=> int(1) [1]=> int(1) [2]=> int(16) [3]=> int(81) [4]=> int(625) }

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