函数

function array_value_sum(){    $res = array();    foreach (func_get_args() as $arr) {        foreach ($arr as $k => $v){            if (!isset($res[$k])){                $res[$k] = $v;            }else{                $res[$k] += $v;            }        }    }    return $res;}

实例：

$arr1 = array(311=>1, 312=>2, 314=>2);$arr2 = array(311=>2, 312=>2, 313=>5, 314=>9);$arr3 = array(314=>10);$newArr = array_value_sum($arr1, $arr2, $arr3);print_r($newArr);

输出：

Array ( [311] => 3 [312] => 4 [314] => 21 [313] => 5 )