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警告:mysql_num_rows()預計參數1是資源,布爾在C中給出:\ XAMPP \ htdocs中\ newsite上線\ view_category.php 117php參數問題,最新錯誤?
我知道它'if(mysql_num_rows($res2) > 0)'
,但它應該是真正的0 ,如果不是,我下一步該做什麼?
這裏的代碼
$cid = $_GET['cid'];
\t \t if (isset($_SESSION['uid'])){
\t \t \t $logged = " | <a href='create_topic.php?cid=".$cid."'>Click Here To Create A Topic</a>";
\t \t }
\t \t else {
\t \t \t $logged = " | Please log in to create topics in this forum.";
\t \t
\t \t }
\t \t $sql = "SELECT id FROM categories WHERE id='".$cid."' LIMIT 1";
\t \t $res = mysql_query($sql) or die(mysql_error());
\t \t if (mysql_num_rows($res) == 1) {
\t \t \t $sql2= "SELECT * FROM topics WHERE category_id='".$cid."' ORDER BY topic_reply_date DESC";
\t \t \t $res2= (mysql_query($sql2) or die(mysql_error()));
\t \t \t if(mysql_num_rows($res2) > 0) {
\t \t \t \t $topics .= "<table width='100%' style='border-collapse: collapse;'>";
\t \t \t \t $topics .= "<tr><td colspan='3'><a href='thread.php'>RETURN TO FORUM INDEX</a>".$logged."<hr /></td></tr> ";
\t \t \t \t $topics .= "<tr style='background-color: #dddddd;'><td>TOPIC TITLE</td><td width='65' align='center'>REPLIES</td><td width='65' align='center'>VIEWS</td></tr>";
\t \t \t \t $topics .= "<tr><td colspan = '3'><hr /></td><tr>";
\t \t \t \t while ($row = mysql_fetch_assoc($res2)){
\t \t \t \t \t $tid = $row['id'];
\t \t \t \t \t $title = $row['topic_title'];
\t \t \t \t \t $views = $row['topic_views'];
\t \t \t \t \t $date = $row['topic_date'];
\t \t \t \t \t $creator = $row['topic_creator'];
\t \t \t \t \t $topics .= "<tr><td><a href='view_topic.php?cid=".$cid."&tid=".$tid."'>".$title."</a><hr /><span class ='post_info'>Posted by: ".$creator." on ".$date."</span></td><td align='center'>0</td><td align='center'>".$views."</td></tr>";
\t \t \t \t \t $topics .= "<tr><td colspan = '3'><hr /></td></tr>";
\t \t \t \t \t
\t \t \t \t }
\t \t \t \t $topics .= "</table>";
\t \t \t }else{
\t \t \t \t echo "<a href='thread.php'>Return to Forum Index</a><hr/>";
\t \t \t \t echo "<p> There are no topics in this category yet.</p>";
\t \t \t }
\t \t }
\t \t \t else{
\t \t \t \t echo "<a href='form.php'>Return to Forum Index</a><hr/>";
\t \t \t \t echo "<p>You ar trying to view an unexisted category";
\t \t \t \t
\t \t \t \t
\t \t \t } \t
\t \t ?>
太感謝你了
此錯誤意味着您正試圖獲得對一個查詢選出的記錄數,但該查詢並沒有因錯誤成功地完成。所以你必須先解決查詢。順便說一句,您正在使用已在PHP7中刪除的棄用API(mysql_ *)。切換到mysqli_ *或PDO,並學習avout準備語句,以防止sql注入 –
此代碼通過[小Bobby表](https://xkcd.com/327/)批准。 – bishop