<?php

class User
{
    protected $login;
    protected $password;
    public function __construct($_POST['login'], $_POST['password'])
    {
        $login->login = $_POST['login'];
        $password->password = $_POST['password'];
    }

    public function getData()
    {
        return login;
        return password;
    }

}

$newUser = new User();

$newUser->getData();
?>