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<?php $array = [ ['a' => 1, 'b' => 2], ['a' => 2, 'b' => 2] ]; $data = new stdClass(); $data->count = 0; $data->a = 0; $data->b = 0; $cb = function($value, $key, &$data) { $data->count = $data->count + 1; $data->a = $data->a + $value['a']; $data->b = $data->b + $value['b']; }; array_walk($array, $cb, $data); var_dump($data);
Output for git.master, git.master_jit, rfc.property-hooks
Warning: {closure}(): Argument #3 ($data) must be passed by reference, value given in /in/pYepQ on line 19 Warning: {closure}(): Argument #3 ($data) must be passed by reference, value given in /in/pYepQ on line 19 object(stdClass)#1 (3) { ["count"]=> int(2) ["a"]=> int(3) ["b"]=> int(4) }

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