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基本上我在我的通用論壇中編輯了「new_topic」頁面，以便用戶可以從下拉列表中選擇帖子的類別，而不是先轉到類別，去新的話題，我現在要做的是線程創建時，而不是跳轉到標準的「你的新線程在這裏創建」它重定向到該主題下的類別。PHP/Mysql創建線程，然後重定向到論壇類別
我嘗試使用
header("Location: category.php?id='. $topic_cat . '");
但頭已經被用於其他地方。 所以我發現，工作在一定程度上元刷新..
echo "<META HTTP-EQUIV='Refresh' Content='0; URL=/category.php?id='. $topic_cat .'>";
但它重定向到「category.phpid =」而輸出下面的消息.. 類別無法顯示，請再試一次稍後。您的SQL語法中有錯誤;檢查與您的MySQL服務器版本相對應的手冊，以在第8行''附近使用正確的語法
是否有無論如何我可以讓頁面跳轉到只在submit函數本身定義的類別？謝謝你的幫助。
編輯：將使用「如果」功能工作來定義重定向？即。如果在重定向到category.phpid = 2的形式中選擇topic_cat 2 對不起，我很新的PHP和仍然試圖繞過它在我的頭上所有:( 這裏是主題產生頁面，在它的全部
<?php
//create_topic.php
include 'connect.php';
if($_SESSION['signed_in'] == false)
{
//the user is not signed in
echo 'Sorry, you have to be <a href="/forum/signin.php">signed in</a> to create a topic.';
}
else
{
//the user is signed in
if($_SERVER['REQUEST_METHOD'] != 'POST')
{
//the form hasn't been posted yet, display it
//retrieve the categories from the database for use in the dropdown
$sql = "SELECT
cat_id,
cat_name,
cat_description
FROM
categories";
$result = mysql_query($sql);
if(!$result)
{
//the query failed, uh-oh :-(
echo 'Error while selecting from database. Please try again later.';
}
else
{
if(mysql_num_rows($result) == 0)
{
//there are no categories, so a topic can't be posted
if($_SESSION['user_level'] == 1)
{
echo 'You have not created categories yet.';
}
else
{
echo 'Before you can post a topic, you must wait for an admin to create some categories.';
}
}
else
{
echo '<form method="post" action="">';
echo '<select name="topic_cat">';
while($row = mysql_fetch_assoc($result))
{
echo '<option value="' . $row['cat_id'] . '">' . $row['cat_name'] . '</option>';
}
echo '</select><br />';
echo '<textarea name="post_content" /></textarea><br /><br />
<input type="submit" value="Create topic" />
</form>';
}
}
}
else
{
//start the transaction
$query = "BEGIN WORK;";
$result = mysql_query($query);
if(!$result)
{
//Damn! the query failed, quit
echo 'An error occured while creating your topic. Please try again later.';
}
else
{
//the form has been posted, so save it
//insert the topic into the topics table first, then we'll save the post into the posts table
$sql = "INSERT INTO
topics(topic_subject,
topic_date,
topic_cat,
topic_by)
VALUES('" . mysql_real_escape_string($_POST['post_content']) . "',
NOW(),
" . mysql_real_escape_string($_POST['topic_cat']) . ",
" . $_SESSION['user_id'] . "
)";
$result = mysql_query($sql);
if(!$result)
{
//something went wrong, display the error
echo 'An error occured while inserting your data. Please try again later.<br /><br />' . mysql_error();
$sql = "ROLLBACK;";
$result = mysql_query($sql);
}
else
{
//the first query worked, now start the second, posts query
//retrieve the id of the freshly created topic for usage in the posts query
$topicid = mysql_insert_id();
$sql = "INSERT INTO
posts(post_content,
post_date,
post_topic,
post_by)
VALUES
('" . mysql_real_escape_string($_POST['post_content']) . "',
NOW(),
" . $topicid . ",
" . $_SESSION['user_id'] . "
)";
$result = mysql_query($sql);
if(!$result)
{
//something went wrong, display the error
echo 'An error occured while inserting your post. Please try again later.<br /><br />' . mysql_error();
$sql = "ROLLBACK;";
$result = mysql_query($sql);
}
else
{
$sql = "COMMIT;";
$result = mysql_query($sql);
echo "<META HTTP-EQUIV='Refresh' Content='0; URL=/category.php?id=". $topic_cat ."'>";
}
}
}
}
}
; ?>
因爲回聲在雙引號中，變量應該插值而不用連接 –