php – 当进入登录页面时,如果已登录则重定向到索引

当用户首先没有登录时转到索引,它将重定向到登录页面.

但是,如果用户在登录时尝试打开登录页面,如何将用户重定向到索引？

我的登录PHP：

    <?PHP
if(isset($_POST["button_login"]))           //FUNGSI LOGIN
{ 

    $user   = $_POST["name"];
    $pass   = $_POST["password"];

    $sql_login      = "SELECT * FROM user WHERE username='$user' AND password='$pass'";
    $result_login   = $conn->query($sql_login);
    $row_login      = $result_login->fetch_assoc();
    $numrow_login   = $result_login->num_rows;

    if($numrow_login==1)
    {
        session_start();
        $_SESSION['user'] = $user;
        header('Location:index.PHP?');
    }
}
?>

解决方法:

您应该首先测试它们是否已经登录.它最好是在脚本文件顶部的session_start()

<?PHP
session_start();

// If user already logged in, send them to index
if ( ! empty( $_SESSION['user'] ) ) {
    header('Location:index.PHP?');
    exit;
}

if(isset($_POST["button_login"]))           //FUNGSI LOGIN
{ 

    $user   = $_POST["name"];
    $pass   = $_POST["password"];

    $sql_login      = "SELECT * FROM user WHERE username='$user' AND password='$pass'";
    $result_login   = $conn->query($sql_login);
    $row_login      = $result_login->fetch_assoc();
    $numrow_login   = $result_login->num_rows;

    if($numrow_login==1)
    {
        $_SESSION['user'] = $user;
        header('Location:index.PHP?');
        exit;
    }
}
?>