显示空白值的PHP表

我正在构建一个论坛页面，这是我的第一个PHP项目。我已经成功地连接了我的表并将值存储在PHPMYADMIN中，但它们没有显示在我的主论坛页面上，相反，显示的行会增加，但它们会存储空值，有什么建议吗？

<?php
include ('includes/session.php');
include ('includes/header.php');
$host = "localhost";
$username = "fses16g6";
$password = "fses16g6";
$db_name="fses16g6"; // Database name 
$tbl_name="forum_question"; // Table name 
// Connect to server and select databse.
mysql_connect("$host", "$username", "$password")or die("cannot connect"); 
mysql_select_db("$db_name")or die("cannot select DB");
$sql="SELECT * FROM $tbl_name ORDER BY id DESC";
// OREDER BY id DESC is order result by descending 
$result=mysql_query($sql);
?>
<table width="90%" border="0" align="center" cellpadding="3" cellspacing="1"        bgcolor="#FFFFFF">
<tr>
<td width="6%" align="center" bgcolor="#000000"><strong>#</strong></td>
<td width="53%" align="center" bgcolor="#000000"><strong>Topic</strong></td>
<td width="15%" align="center" bgcolor="#000000"><strong>Views</strong></td>
<td width="13%" align="center" bgcolor="#000000"><strong>Replies</strong>    </td>
<td width="13%" align="center" bgcolor="#000000"><strong>Date/Time</strong> </td>
</tr>
<?php
while($rows=mysql_fetch_array($result)){
?>
<tr>
<td bgcolor="#FFFFFF"><? echo $rows['id']; ?></td>
<td bgcolor="#FFFFFF"><a href="view_topic.php?id=<? echo $rows['id']; ?>">    <echo $rows['topic']; ?></a><BR></td>
<td align="center" bgcolor="#FFFFFF"><? echo $rows['view']; ?></td>
<td align="center" bgcolor="#FFFFFF"><? echo $rows['reply']; ?></td>
<td align="center" bgcolor="#FFFFFF"><? echo $rows['datetime']; ?></td>
</tr>
<?php
// Exit looping and close connection 
}
mysql_close();
?>
<tr>
<td colspan="5" align="right" bgcolor="#black"><a href="create_topic.php">    <strong>Create New Topic</strong> </a></td>
</tr> 
</table>
<?php
//if ($is_user) {
    //echo 'Welcome to Gamers Paradise' 
//else echo 'You must be logged in to post.' 
            //}
if ($is_admin) {
                echo '<button type="button">EDIT</button>';
                echo '<button type="button">DELETE</button>';
            }
include ('includes/footer.html');
?>

这是的桌子

CREATE TABLE `forum_question`  
(`id` int(4) NOT NULL auto_increment,`topic` varchar(255) NOT NULL default'',  
`detail` longtext NOT NULL,  
`name` varchar(65) NOT NULL default '',  
`email` varchar(65) NOT NULL default '',  
`datetime` varchar(25) NOT NULL default '',  
`view` int(4) NOT NULL default '0',  
`reply` int(4) NOT NULL default '0',  
PRIMARY KEY (`id`)
) TYPE=MyISAM AUTO_INCREMENT=1 ;