根据数组某个字段排序

   function arraySort($array, $keys, $sort = 'asc')
    {
        $newArr = $valArr = array();
        foreach ($array as $key => $value) {
            $valArr[$key] = $value[$keys];
        }
        ($sort == 'asc') ? asort($valArr) : arsort($valArr);
        reset($valArr);
        foreach ($valArr as $key => $value) {
            $newArr[$key] = $array[$key];
        }
        return $newArr;
    }