谷歌浏览器“；重定向循环”；但在其他网络浏览器中没有 - Google Chrome "Redirect Loop" but not in other web browsers

我实现了一个网站，在某个目录中托管学校文件，索引页面只是一个登录页面。当我使用谷歌浏览器访问这个网站时，它会不断地给我一个"重定向循环错误"，然而，如果我使用任何其他浏览器，那么网站就会正常加载。

我的index.php站点代码如下，任何建议都将不胜感激。

网站url为：https://secure.fixnode.ca/

谢谢，Phillip K

<?php
session_start();
function loggedin()
{
 if (isset($_SESSION['myusername']) || isset($_COOKIE['myusername']))
 {
    $loggedin = TRUE;
    return $loggedin;
 }
}
if (loggedin())
{
 header("Location: /login_success.php");
die();
}
if(isset($_POST['submit']))
{
$host="localhost"; // Host name 
$username="user"; // Mysql username 
$password="password"; // Mysql password 
$db_name="database_name"; // Database name 
$tbl_name="table_name"; // Table name
// Connect to server and select databse.
mysql_connect("$host", "$username", "$password")or die("cannot connect"); 
mysql_select_db("$db_name")or die("cannot select DB");
// username and password sent from form 
$myusername=$_POST['username']; 
$mypassword=$_POST['password'];
$rememberme=$_POST['rememberme'];
// To protect MySQL injection (more detail about MySQL injection)
$myusername = stripslashes($myusername);
$mypassword = stripslashes($mypassword);
$myusername = mysql_real_escape_string($myusername);
$mypassword = mysql_real_escape_string($mypassword);
$encrypted_mypassword=md5($mypassword);
$sql="SELECT * FROM $tbl_name WHERE username='$myusername' and password='$encrypted_mypassword'";
$result=mysql_query($sql);
mysql_close();
// Mysql_num_row is counting table row
if(mysql_num_rows($result) == 1) //user exists
{
  if ($rememberme=="on"){
      setcookie("myusername", $myusername, time()+7200);
   }
 elseif ($rememberme==""){
      $_SESSION['myusername'] = $myusername;
   }
header("Location: /login_success.php");
exit();
}
else {
echo '<div class="alert">Incorrect Username or Password!</div>';
}
}
?>

<?php
// DETECT MOBILE DEVICE
//session_start();
$user_agent=$_SERVER['HTTP_USER_AGENT'];
$iphone = strpos($user_agent,"iPhone");
$android = strpos($user_agent,"Android");
$palmpre = strpos($user_agent,"webOS");
$berry = strpos($user_agent,"BlackBerry");
$ipod = strpos($user_agent,"iPod");
if($_GET['mobile_site'])
{
    if (strcmp($_GET['mobile_site'],"false")==0)
    $_SESSION['mobile_site']=false;
    if (strcmp($_GET['mobile_site'],"true")==0)
    $_SESSION['mobile_site']=true;
}
if ($iphone || $android || $palmpre || $ipod || $berry == true)
{
$_SESSION['mobile_device']=true;    //
if (isset($_SESSION['mobile_site']))
    {
    }
else
    $_SESSION['mobile_site']=true;
}
else
{
$_SESSION['mobile_site']=false;
$_SESSION['mobile_device']=false;
}
?>
<!DOCTYPE HTML>
<html>
<head>
<title>Secure Customer Login</title>
<meta charset="UTF-8" />
<script type="application/javascript" src="scripts/bubble_bookmark.js" charset="utf-></script>
<link rel="apple-touch-icon" href="/images/apple-touch-icon.png">
<meta http-equiv="X-UA-Compatible" content="IE=9" />
<?php if($_SESSION['mobile_site']==true){ ?>
<meta name="viewport" content="width=device-width, minimum-scale=1.0, maximum-scale=1.0" />
<meta name="apple-mobile-web-app-capable" content="yes" />
<meta name="apple-mobile-web-app-status-bar-style" content="black" />
<?php } ?>
<script type='text/javascript'>
    function navigator_Go(url) {
    window.location.assign(url); 
    }
    </script>
<script type="text/javascript">
var addToHomeConfig = {
touchIcon: true,
};
</script>
<link rel="stylesheet" type="text/css" href="css/reset.css">
<link rel="stylesheet" type="text/css" href="css/structure.css">
<script>document.createElement('footer');</script>
</head>
<body>
<center><img src="/images/logo.png"></center>
<form class="box login" name="login" method="post" action="<?php echo htmlentities($_SERVER['PHP_SELF']); ?>">
<fieldset class="boxBody">
  <label>Username</label>
  <input type="email" name="username" tabindex="1" placeholder="Email" required="required">
  <label><?php if($_SESSION['mobile_site']==true){ ?><a href="javascript:navigator_Go('recovery.php');" class="rLink" tabindex="5">Forget your password?</a><?php } ?><?php if($_SESSION['mobile_site']==false){ ?><a href="recovery.php" class="rLink" tabindex="5">Forget your password?</a><?php } ?>Password</label>
  <input type="password" name="password" tabindex="2" placeholder="Password" required="required">
</fieldset>
<footer>
  <label><input type="checkbox" tabindex="3" name="rememberme">Keep me logged in</label>
  <input type="submit" name="submit" value="Login" class="btnLogin" tabindex="4">
</footer>
</form>
<footer id="main">
  &copy; 2011 Fixnode Computer Services.  All rights reserved.</a>
</footer>
</body>
</html>

该子域上的任何URL都会将浏览器发送到重定向循环中。例如：

https://secure.fixnode.ca/loops-are-cool

似乎还有其他东西在做重定向。也许在.htaccess文件中？

在登录时使函数loggedin（）return true;和return false；未登录时，使用if(loggedin() == true)检查功能并且使用CCD_ 5 来代替CCD_