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<?php $data = [ 'item_1' => 'value_1', 'item_2' => 'value_2', ]; var_dump(array_walk($data, static function (&$value, &$key) { $value = $key; })); var_dump($data);
Output for git.master, git.master_jit, rfc.property-hooks
Warning: {closure}(): Argument #2 ($key) must be passed by reference, value given in /in/ZmrdO on line 8 Warning: {closure}(): Argument #2 ($key) must be passed by reference, value given in /in/ZmrdO on line 8 bool(true) array(2) { ["item_1"]=> string(6) "item_1" ["item_2"]=> string(6) "item_2" }

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