Untitled

<?php
require_once 'Classes/ClassUser.php';
require_once 'DBconnect.php';

if ($_SERVER['REQUEST_METHOD'] === 'POST') {
    if (isset($_POST['email']) && isset($_POST['password']) && isset($_POST['username'])) {

        $mail = $_POST['email'];
        $pas = $_POST['password'];
        $uName = $_POST['username'];

        $user = new User();
        $user->setEmail($mail);
        $user->setUsername($uName);
        $user->setHashPass($pas);
        $a = $user->saveToDB($conn);

        session_start();
        $sql = "SELECT id FROM users WHERE email ='$mail' and hash_pass = '$pas'";

        $result = $conn->query($sql);
        var_dump($result);
//       $row = mysqli_fetch_array($result,MYSQLI_ASSOC);
        $row = $result->fetch(PDO::FETCH_ASSOC);
        var_dump($row);


        $count = count($result);
        var_dump($count);

        // If result matched $myusername and $mypassword, table row must be 1 row

        if($count == 1 && $row != false) {
            $_SESSION['login_userId'] = $row['id'];

            header("location: HomePage.php");
        }else {
            $error = "Your Login Name or Password is invalid";
            echo $error;
        }
    }


}
?>
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<h2>Rejestracja</h2>
<form action="" method="post">
    Podaj nazwę użytkownika :
    <input type="text" name="username"> </input>
    Podaj adres email :
    <input type="text" name="email"> </input>
    Podaj hasło :
    <input type="text" name="password"> </input>
    <button type="submit">Zarejestruj się</button>

</form>
</body>
</html>