Untitled Page

<!DOCTYPE html>
<html lang="en">
<?php
$con = new mysqli('127.0.0.1', 'root', '', 'user');

if ($_SERVER['REQUEST_METHOD'] === 'POST') {
    $email = $_POST['email'];
    $password = $_POST['password'];

    $stmt = $con->prepare("SELECT passwordHash FROM users WHERE email = ?");
    $stmt->bind_param("s", $email);
    $stmt->execute();
    $res = $stmt->get_result()->fetch_assoc();

    if ($res && password_verify($password, $res['passwordHash'])) {
        echo "Hasło prawidłowe";
    } else {
        echo "Hasło nieprawidłowe";
    }
}
?>
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <form action="login.php" method="post">
        <label>email:</label>
        <input type="email" name="email"><br><br>

        <label>password:</label>
        <input type="password" name="password"><br><br>

        <button type="submit">send</button>
    </form>
</body>
</html>