Question

if(!$_SESSION['username']) {


     $ip = $db->real_escape_string(VisitorIP());
         $username = $db->real_escape_string($_POST['username']);
         $password = $db->real_escape_string($_POST['password']);
     $salt = "****";
     $password = md5($password . $salt);
         $result = $db->query("SELECT * FROM TABLE WHERE username='$username' and password='$password'");
         $count = mysqli_num_rows($result);
        if ($count == 1){
            $bannedq = $db->query("SELECT banned FROM TABLE WHERE username='$username' AND password='$password'");
            $banned = $bannedq->fetch_row();
            if($banned[0] == "1") {
            $failedLogin="1";
            $message = 'You are banned and you cannot login';
            } else {
                                $ip = $db->real_escape_string(VisitorIP());
                $db->query("UPDATE h_users SET lastlogin=now(), lastip = '$ip' WHERE username='$username'");
                                header("Location: home");
                session_start();
                $_SESSION['username'] = $username;
                $_SESSION['password'] = $password;

                $failedLogin = "1";
                $message   = 'Username or Password WRONG!';
                }
            }
} else {
header("location: home");
}

你好程序员，我正在尝试在我的网站上设置登录系统。到目前为止它工作正常但是当会话设置好并且用户现在被重定向到主页时如果他进入登录屏幕并且会话被设置我希望他重定向到主页而不再看到登录屏幕。但我之后添加了这部分：

if(!$_SESSION['username']) {

它不起作用

Answer 1

你必须先开始你的会话并在你使用它之前把它放在那里，所以在你的if语句之前写这个：

session_start();
if(!$_SESSION['username']) {
//...

并在此处删除此内容：

/...
session_start();
$_SESSION['username'] = $username;
$_SESSION['password'] = $password;
/...

（另外我会在每个标题后添加die();或exit();，它确保标题后没有执行任何内容）

Answer 2

好的，谢谢你的帮助＆lt; 3＆lt; 3 我把我的代码更改为了这一切，一切都很顺利

session_start();
if(!isset($_SESSION['username'])) {
 if(isset($_POST['username']) && isset($_POST['password'])) {
     $ip = $db->real_escape_string(VisitorIP());
         $username = $db->real_escape_string($_POST['username']);
         $password = $db->real_escape_string($_POST['password']);
     $salt = "ho073";
     $password = md5($password . $salt);
         $result = $db->query("SELECT * FROM TABLE WHERE username='$username' and password='$password'");
         $count = mysqli_num_rows($result);
        if ($count == 1){
            $bannedq = $db->query("SELECT banned FROM TABLE WHERE username='$username' AND password='$password'");
            $banned = $bannedq->fetch_row();
            if($banned[0] == "1") {
            $failedLogin="1";
            $message = 'You are banned and you cannot login';
            } else {
                                $ip = $db->real_escape_string(VisitorIP());
                $db->query("UPDATE TABLE SET lastlogin=now(), lastip = '$ip' WHERE username='$username'");
                                header("Location: home");
                $_SESSION['username'] = $username;
                $failedLogin = "1";
                $message   = 'Username or Password WRONG!';
                }
            }
    }
        include'templates/login.html';
} else {
header("location: home");
die();
}

非常爱你＆lt; 3

如果会话重定向到主页

2 个答案: