php合并数组中的数据，如果键值相等其值相加的实现办法

/*
* 合并数据，如果键值相等其值相加
* @param array $descs
* @param array $json_wares
*/
public static function getArrayMerge($descs, $json_wares)
{
   if (is_array($descs) && is_array($json_wares)) {
    $arrayMerge = array();
    foreach ($json_wares as $key=>$value) {
     if (array_key_exists($key, $descs)) {
      $arrayMerge[$key] = $value + $descs[$key];
      unset($descs[$key]);
     } else {
      $arrayMerge[$key] = $value;
     }
    }
    return $arrayMerge+$descs;
   } else {
    return false;
   }
} 

function comm_sumarrs($arr){
    $item = array();
    foreach($arr as $key=>$value){

        foreach($value as $k=>$v){
            if(isset($item[$k])){
                $item[$k] = $item[$k] +$v;
            }else{
                $item[$k] = $v;
            }
        }
    }
    arsort($item);
    return $item;
}