php数组相加合并函数，多个数组相同键名项键值相加。

最近做的一个项目要实现多个相同数组的相加合并功能，需要实现对应键名的键值相加，具体说明如下：

有如下多个数组：

  array(13) {    [14] => string(1) "4"    [15] => string(1) "4"    [16] => string(1) "4"    [17] => string(1) "4"    [18] => string(1) "4"    [19] => string(2) "30"    [20] => string(2) "10"    [21] => string(1) "5"    [22] => string(1) "2"    [23] => string(1) "2"    [24] => string(1) "1"    [25] => string(2) "17"    [26] => string(2) "10"  }  array(13) {    [14] => string(1) "4"    [15] => string(1) "4"    [16] => string(1) "3"    [17] => string(1) "3"    [18] => string(1) "4"    [19] => string(2) "30"    [20] => string(2) "10"    [21] => string(1) "5"    [22] => string(1) "2"    [23] => string(1) "1"    [24] => string(1) "1"    [25] => string(2) "15"    [26] => string(2) "10"  }  array(13) {    [14] => string(1) "3"    [15] => string(1) "4"    [16] => string(1) "4"    [17] => string(1) "4"    [18] => string(1) "4"    [19] => string(2) "30"    [20] => string(1) "5"    [21] => string(1) "5"    [22] => string(1) "2"    [23] => string(1) "2"    [24] => string(1) "1"    [25] => string(2) "15"    [26] => string(2) "10"  }

要合并为一个数组，其中对应项的值相加，得出的数组如下（以下数组只为示例，并非实际运算结果）：

  array(13) {    [14] => int(11)    [15] => int(12)    [16] => int(14)    [17] => int(14)    [18] => int(16)    [19] => int(118)    [20] => int(34)    [21] => int(19)    [22] => int(8)    [23] => int(7)    [24] => int(4)    [25] => int(65)    [26] => int(38)  }

具体函数代码：

  //数组相同键，值相加。  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;  }

调用方式：

  $arr = array();  foreach ($array as $k => $v) {      $v = json_decode($v,true);      $arr = array_value_sum($v,$arr);  }  var_dump($arr);