PHP 多维数组 根据字段排序

这个太常用了，记录下、方便后面用

/**
 * @param $arr [要排序的数组]
 * @param $condition [要排序的条件, for  array('id'=>SORT_DESC,'add_time'=>SORT_ASC)]
 * @return bool|mixed
 * 对二维数组多个字段排序
 */
function SortArrByManyField($arr,$condition)
{
    if (empty($condition)) {
        return false;
    }
    $temp = array();
    $i = 0;
    foreach ($condition as $key => $ar) {
        foreach ($arr as $k => $a) {
            $temp[$i][] = $a[$key];
        }
        $i += 2;
        $temp[] = $arr;
    }
    $temp =& $arr;
    call_user_func_array('array_multisort', $temp);
    return array_pop($temp);
}