syntax error, unexpected end of file

qq_39873230 2017-08-16 07:23:31

<?php
// 首页

session_start();
if($_GET['act']=="loginout"){
$_SESSION['username']='';
?>
<script>location.href="?";</script>
<?
exit;
}

header("content-type:text/html;charset=utf-8");
$servername="localhost";
$username="root";
$password="";
$dbname="mybbs";

//创建连接
$conn=mysqli_connect($servername,$username,$password,$dbname);
mysqli_set_charset($conn, 'utf-8');

?>
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>论坛</title>
<style>
.cen{
width:55%;
margin:0 auto;
text-align:right;
margin-top:30px;
}
table{
width:55%;
margin-top:10px;
}
.title{
background-color:#B10707;
font-size:17px;
color:white;
}
.right{
margin-left:120px;
}
</style>
</head>

<body>
<div class="cen">
<?php
if($_SESSION['username']){
?>
<a href="?act=loginout">退出</a>
<?php }
else{
?>
<a href="login.html">登录</a>|<a href="reg.html">注册</a>
<?php
}
?>
</div>
<table border="1" cellspacing="0" cellpadding="8" align="center">
<tr class="title">
<td COLSPAN="3">
论坛列表<span class="right">[<a style="color:white" href="add_forum.php">
添加</a>]</span>
</td>
</tr>
<tr>
<td width="10%"><strong>主题</strong></td>
<td width="40"><strong>论坛</strong></td>
<td width="15"><strong>最后更新</strong></td>
</tr>
<?php
$sql="select*from forums";
$que=mysqli_query($conn, $sql);
$sum=mysqli_num_rows($que);
if($sum>0){
while($row = mysqli_fetch_array($que)){
?>
<tr>
<td><?php echo $row['subject']?></td>
<td><?php echo "<div class=\"bold\"><a class=\"forum\"
href=\"forums.php?F=".$row['id']."\">".$row["forum_name"]."</a></div>"
.$row["forum_description"]?></td>
<td>
<div><?php echo $row["last_post_time"]?> </div>
</td>
</tr>
<?php }
}else{
echo "<tr><td colspan='3'>对不起，论坛正在建设中，感谢您的关注......</td></tr>";
}
?>
</table>
</body>
</html>

请问上面代码哪儿出了问题？应该怎么修改？

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m0_45702898 2019-09-30

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楼主：我想登录论坛登录不了，显示syntax error.是什么意思呢？？？

hongmei85 2017-08-16

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<?php
// 首页

session_start();
if(isset($_GET['act']) && $_GET['act']=="loginout"){
    $_SESSION['username']='';
    echo '<script>location.href="?";</script>';
    exit;
}