二维数组的一个排序-php

/**     * 二维数组排序     * @param $multi_array     * @param $sort_key     * @param int $sort     * @return array|bool     */    public static function multi_array_sort($multi_array,$sort_key,$sort=SORT_ASC){        // 判断是否为数组        if(is_array($multi_array)){            // 循环数组            foreach ($multi_array as $row_array){                // 按某键对应值的小写排序                if(is_array($row_array)){                    $key_array[] = strtolower($row_array[$sort_key]);                }else{                    return false;                }            }        }else{            return false;        }        array_multisort($key_array,$sort,$multi_array);        return $multi_array;    }