$query = DB::query("SELECT DISTINCT t.*$sqlfield
    

// 隨機調用
if ($startrow == 1000) {
    $yunhuifus = DB::query("SELECT DISTINCT t.*$sqlfield
        FROM `" . DB::table('forum_thread') . "` t
        $sqlfrom WHERE {$maxwhere}t.readperm='0'
        $sql
        AND t.displayorder>='0'
        ORDER BY t.$orderby DESC;");
    $sqlNum = mysql_num_rows($yunhuifus);
    $startrow = mt_rand(0, $sqlNum - $items);
}
// 隨機調用