您好我创建了一个论坛网站，其中登录的用户可以使用每个论坛主题上的表单创建主题，但是当我使用表单添加新记录时，它会阻止自身以及之前的主题显示。
我不知道为什么，并且会对任何帮助都很满意。 我的论坛页面显示了类别，主题（如果选择了类别）和回复（如果选择了主题）。这是我的forum.php页面的代码
<div id="midclmn">
<?php
If (isset($_GET['topic'])){
// Show topic & replies
$queryreply = "SELECT a.reply_id,a.reply_text, a.reply_date, b.topic_title, b.topic_date,c.username AS reply_user, (SELECT username FROM users
WHERE user_id=b.user_id) AS topic_creator FROM forum_replies a
LEFT JOIN forum_topics b ON a.topic_id=b.topic_id
LEFT JOIN users c ON a.user_id=c.user_id
WHERE a.topic_id = '".$_GET['topic']."' ";
$result = mysql_query($queryreply) or die (mysql_error());
$row = mysql_fetch_array($result);
if(empty($row['reply_id'])){
echo "No replies have been posted in this Topic, be the first to have your say using form below.";} ?>
<table id="categorytable">
<tr><td><?php echo '<b>'.$row['topic_title'].'</b>';?></b><br></td></tr>
<tr><td><?php echo 'Topic published by '.$row['topic_creator'].' - ( '.$row['topic_date'].' )'.'';?><br><br></td></tr>
<tr><td><?php $row['reply_user'].' Replied with: ';?><br></td></tr>
<tr><td><?php echo $row['reply_text'].'<br><br><i>Published: '.$row['reply_date'].' by '.$row['reply_user'].'</i>';?></td></tr>
<?php
while ($row = mysql_fetch_array($result)){ ?>
<tr><td><?php $row['reply_user'].' Replied with: ';?><br></td></tr>
<tr><td><?php echo $row['reply_text'].'<br><br><i>Published: '.$row['reply_date'].' by '.$row['reply_user'].'</i>';?></td></tr>
<?php
}
?>
</table>
<?php
}elseif (isset($_GET['cat'])){
// Show topics in that category
$querytopic = "SELECT topic_id, topic_title,topic_description, topic_date, category_id FROM forum_topics WHERE category_id = '".$_GET['cat']."'";
$result = mysql_query($querytopic) or die (mysql_error());
$row = mysql_fetch_array($result);
if(empty($row['topic_id'])){
echo "No topics have been posted in this category, be the first to submit a topic using form below."; ?>
<table id="categorytable">
<tr><td><?php echo '<a href="forum.php?topic='.$row['topic_id'].'&cat='.$row['category_id'].'"><b>'.$row['topic_title'].'</b></a>';?></td></tr>
<tr><td><?php echo $row['topic_description'];?><br><br></td></tr>
<tr><td><?php echo "<b>Date Posted:</b> ".$row['topic_date'];?><br><br></td></tr>
<?php
while ($row = mysql_fetch_array($result)){ ?>
<tr><td><?php echo '<a href="forum.php?topic='.$row['topic_id'].'&cat='.$row['category_id'].'"><br>'.$row['topic_title'].'</b></a>';?></td></tr>
<tr><td><?php echo $row['topic_description'];?><br><br></td></tr>
<tr><td><?php echo "<b>Date Posted:</b> ".$row['topic_date'];?><br><br></td></tr>
<?php
}} ?></table><?php
if($_SESSION['loggedin'] === true){
$userid = $_SESSION['id'];
$catid = $_GET['cat'];
?>
<br>
<form method="post" action="topic_process.php" id="topicform">
<h3>Add New Topic</h3>
<input type="hidden" id="catid" name="catid" value=<?php echo $catid?> >
<input type="hidden" id="userid" name="userid" value=<?php echo $userid ?>>
<label for="topictitle">Topic Title: </label>
<textarea rows="2" cols="80" id="topictitle" name="topictitle" required ></textarea>
<br><br>
<label for="topicdescription">Topic Description: </label>
<textarea rows="10" cols="80" id="topicdescription" name="topicdescription" required ></textarea>
<input type= "hidden" id="topicdate" name="topicdate" value=<?php echo ''.date('Y-m-d').'' ?>>
<br><br>
<input type="submit" name="topicsubmit" id="topicsubmit" value="Create Topic">
</form>
<?php
}
?>
<?php
}else{
//Just display the list of categories
$querycategory = "SELECT category_id, category_title,category_description FROM forum_category";
$result = mysql_query($querycategory) or die (mysql_error());
$row = mysql_fetch_array($result); ?>
<table id="categorytable">
<tr><td><?php echo '<a href="forum.php?cat='.$row['category_id'].'">'.$row['category_title'].'</a>';?></td></tr>
<tr><td><?php echo $row['category_description'];?><br><br></td></tr>
<?php
while ($row = mysql_fetch_array($result)){ ?>
<tr><td><?php echo '<a href="forum.php?cat='.$row['category_id'].'">'.$row['category_title'].'</a>';?></td></tr>
<tr><td><?php echo $row['category_description'];?><br><br></td></tr>
<?php
}
?>
</table>
<?php }
?>
</div>
这是流程页面
session_start();
include "includes/connection.php";
echo $_POST['topictitle'];
echo $_POST['topicdescription'];
echo $_POST['userid'];
echo $_POST['catid'];
$query = "INSERT INTO forum_topics
(
category_id,
user_id,
topic_title,
topic_description,
topic_date
)
VALUES
(
'".$_POST['catid']."',
'".$_POST['userid']."',
'".$_POST['topictitle']."',
'".$_POST['topicdescription']."',
'".$_POST['topicdate']."'
)";
mysql_query($query) or die (mysql_error());
header('Location: /TEST/forum.php?'.$_POST['catid'].'');
?>
我也在努力将topic_date记录为今天我在2015-04-28尝试日期（'Y-m-d'）的日期，但它保存为00-00-00。
我知道它有很多代码需要阅读，但我真的卡住了，不想错过任何东西，我也知道mysql_functions已被弃用但已被要求通过uni使用它们。
我使用PHPmyadmin作为数据库，我知道这是垃圾！ 谢谢
编辑：我已经设置了页面，因此它显示了存储在数据库中的所有主题（topic_title，topic_description，user_id，topic_date）。在我向数据库添加一个新主题之前，这个工作正常，但之后包括新主题在内的所有主题都会消失，只留下页面上的表单。所有记录仍然存在于数据库中，删除新记录会带回页面上显示的所有主题。