SMARTY 二次循环的请教

//所有版块@$row_fid = "SELECT * FROM `forum_forum` ORDER BY `displayorder` ASC";$stmt = $pdo->prepare($row_fid);$stmt->execute();$row_forum = $stmt->fetchAll(PDO::FETCH_ASSOC);	//主题分类	foreach ($row_forum as $key => $value) {		$fid = $value["fid"];		@$sql = "SELECT `typeid`,`name` FROM `forum_topic_type` WHERE `fid` = $fid";		$stmt = $pdo->prepare($sql);		$stmt->execute();		$row_type = $stmt->fetchAll(PDO::FETCH_ASSOC);	}		print_r($row_type);$smarty -> assign("all_forum",$row_forum);

//所有版块@$row_fid = "SELECT * FROM `forum_forum` ORDER BY `displayorder` ASC";$stmt = $pdo->prepare($row_fid);$stmt->execute();$row_forum = $stmt->fetchAll(PDO::FETCH_ASSOC);     //主题分类    foreach ($row_forum as $key => $value) {        $fid = $value["fid"];        @$sql = "SELECT `typeid`,`name` FROM `forum_topic_type` WHERE `fid` = $fid";        $stmt = $pdo->prepare($sql);        $stmt->execute();        $row_forum[$key]['list'] = $stmt->fetchAll(PDO::FETCH_ASSOC);    }        print_r($row_forum);$smarty -> assign("all_forum",$row_forum);