<div class="nav-login">
            <form action="login.inc.php" method="post">

                <input type="text" name="username" placeholder="Username"/><br/>

                <input type="password" name="password" placeholder="Password" /><br/><br/>

                <button type="submit" name="submit">login</button>
            </form>
        </div>

        <?php

    if (empty($_POST['username']) || empty($_POST['password'])) {
        echo "Username or Password invaild !";
    } else {

        $conn  = mysqli_connect('localhost', 'root', '', 'system');
        if (!$conn){
            die("Connection failed: " . mysqli_connect_error());
        } else {
            $username = $_POST['username'];
            $password = $_POST['password'];
            $query = "SELECT * FROM user WHERE uid='$username' AND pwd='$password';";
            $result = mysqli_query($conn, $query);
            if(mysqli_num_rows($result) > 0) {
                $row = mysqli_fetch_array($result);
                header('Location: profile.php?id=segev');
            } else {
                header('Location: index.php?login=eroor');
            }
        }

    }