是否可以使用sum将数组值压入现有数组值


is it possible to array push value into existing array value with sum?

是否可以将数组推入现有的数组值?

$nvArr = Array("1"=> 35, "2"=> 1, "3"=> 2, "8"=> 56, "9"=> 78);

我已经添加了一个数组值到现有的数组

$nvArr1 = Array("1"=> 35, "2"=> 1);

And i want like following out put

$nvArr = Array("1"=> 70, "2"=> 2, "3"=> 2, "8"=> 56, "9"=> 78);

可以使用foreach

foreach($nvArr1 as $key => $val){
  (array_key_exists($key, $invArr))?
    $invArr[$key] += $nvArr1[$key]
    : $invArr[$key] = $nvArr1[$key]
}