[PHP]
while ($rows = mysql_fetch_array ($result))
{
$topicname= $rows["topicname"];
$topicTitle= $rows["topictitle"];
$topicid= $rows["topicid"];
$topicdate= $rows["topicdate"];
$replyname= $rows["replyname"];
$replydate= $rows["replydate"];
$textCount= $rows["browserCount"];
$replyCount=$rows["replyCount"];
$ltopicFrom=topicFrom($topicname,$topicTitle,$topicid,$topicdate,$replyname,$replydate,$textCount,$replyCount);

$topic.="$ltopicFrom";
}
[/PHP]
有错误信息如下：
Notice: Undefined variable: topic in /f7168/www_f7168/zyphp/forum.php on line 41

就是 $topic.="$ltopicFrom";
这一行，照理说变量应该不用定义的，为什么还是是未定义的变量？