session_regenerate_id();
session_register ("username") ;
$sessionid = session_id();
$db = new PDO('sqlite:softToken.db');
$sql = "update userinfo set sessionid ='$sessionid' where username='$username' and passwd='$passwd';";
$query = $db->prepare($sql);
$query->execute();
$_SESSION["username"] = $username;
$url = "main.php?sid=".session_id();
unset($db);
echo "<font color=blue>登录成功,正在跳转!</font>" ;
header ("Location:$url");
<?php
header('Content-type:text/html; charset=utf-8');
$sessionid = $_GET['sid'];
session_id($sessionid);
session_start ();
$username = $_SESSION["username"];
$db = new PDO('sqlite:softToken.db');
$sql = "select * from userinfo where username='$username' and sessionid='$sessionid';";
$query = $db->prepare($sql);
$query->execute();
$user = $query->fetch(PDO::FETCH_OBJ);
if ($user->username == ""){
session_destroy();
echo "<script language='javascript' type='text/javascript'>" ;
echo "window.location.href = 'index.html';" ;
echo "</script>" ;
exit () ;
}
?>
<html>
<body>
......
</body>
</html>
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