Untitled

<?php
class User{
    private $login;
    private $email;
    private $password;

    function __construct(){
    }
    function __construct2($login, $email, $password){
        $this->login = $login;
        $this->email = $email;
        $this->password = $password;
    }

    public function getLogin()
    {
        return $this->login;
    }
    public function setLogin($login)
    {
        $this->login = $login;
    }
    public function getEmail()
    {
        return $this->email;
    }

    public function setEmail($email)
    {
        $this->email = $email;
    }

    public function getPassword()
    {
        return $this->password;
    }

    public function setPassword($password)
    {
        $this->password = $password;
    }

}

<?php
require_once ("User.php");
$login = "root";
$pass = "root";
$host = "mylocalhost";
$dbname = "user";
$db = new PDO('mysql:host=localhost; dbname=user', $login);
$user = new User();
if($_SERVER['REQUEST_METHOD']=='POST'){
    $user->setLogin($_POST['login']);
    $user->setEmail($_POST['email']);
    $user->setPassword($_POST['password']);

    print_r($user->getLogin());

    $sql = "INSERT INTO users(login, email, password)
       VALUES ('$user->getLogin()', '$user->getEmail()', '$user->getPassword()')";
$db->query($sql);
  }

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
    <form action="../php/addUser.php" method="post">
        <lable>input you login</lable>
        <input type="text" name="login" id="login" >
        <lable>input you email</lable>
        <input type="text" name="email" id="email" >
        <lable>input you password</lable>
        <input type="password" name="password" id="password" >
        <button type="submit" name="btn">регистрация</button>

    </form>
</body>
</html>