登录页面无法正常运行

Question

When I open the login page for the first time, even if I use correct username and password, the login page is not being redirected to home page. But on the second login it is properly being redirected to home page. The code of login.php looks like this.

<?php
session_start();
$_SESSION['login_user'] = false;
?>

Rest of login.php is simple html and the login form data is sent to validate.php where validate.php looks like this.

<?php
session_start();
    $username="";
    $password="";
    $usernameErr=""; 
    $passwordErr="";
    $empty=false;
    $_SESSION['login_user'] = false;
    if(isset($_POST['submit']))
    {
        if(empty($_POST['username']))
        {
            $empty=true;
            $usernameErr="Username is empty. Please try again";
        }
        else 
            {
                $username=$_POST['username'];
            }
        if(empty($_POST['password']))
        {
            $empty=true;
            $passwordErr="Password is empty. Please try again";
        }
        else 
            {
                $password=$_POST['password'];
            }
        if(!$empty)
        {
            $servername="myxor.in.mysql";
            $dbusername="myxor_in";
            $dbpassword="srikanth177";
            $dbname="myxor_in";
            $conn=new mysqli($servername, $dbusername, $dbpassword, $dbname);
            if($conn->connect_error) 
            {
                die("Connection failed: " . $conn->connect_error);
            }
            $sql = "SELECT firstname,package,username,password FROM users WHERE username='$username'";
            $result = $conn->query($sql);
            if (($result->num_rows) > 0) 
            {
                $row = $result->fetch_assoc();
                if($username === $row['username']) 
                    {
                        if($password === $row['password'])
                        {
                            $_SESSION['fname'] = $row['firstname'];
                            $_SESSION['pack'] = $row['package'];
                            //$_SESSION['login_user'] = $username;
                            $_SESSION['login_user'] = true;
                            header('Location: http://www.myxor.in/home.php');
                            exit;
                        }
                        else
                        {
                            $passwordErr = "Invalid Password. Please Try Again";
                        }
                    }
            } else
            {
                $usernameErr = "Invalid Username. Please Try Again";
            }
        }
    }
    else echo "submit not set";
    echo $usernameErr;
    echo "<br>";
    echo $passwordErr;
?>

Any suggestions why the login page is not functioning for the first time (Note that when I login second time its being properly redirected to required home.php)

Answer 1

You should print your session variables on the login page. Something like this:

var_dump($_SESSION);

So that when you enter the login information and are not redirected on the first try, you will see if the values are being set. That's the first step to take. Then you will have a better idea of what you need to change in your files.