<?php
 class authenticate
 {
    private $name;
    private $password;

    public function login($name, $password)
    {
        $this->name = $name;
        $this->password = $password;

        if($this->check())
        {
            echo "Onnistui!";
        }
        else
        {
            echo "OHO";
        }
    }

    protected function check()
    {
        if($this->name == "Miika")
        {
            if($this->password == "Salasana")
            {
                $this->password = "";
                return true;
            }
        }
        return false;
    }

    public function identify()
    {
        echo "<br>".$this->name;
        echo "<br>".$this->password;
    }

 }
 if(isset($_POST["login"]))
 {
    $logger = new authenticate();
    $logger->login($_POST["name"], $_POST["password"]);
    $logger->identify();
 }
 ?>
 <form action="?" method="post">
 Nimi:<br><input type="text" name="name"><br>
 Salasana:<br><input type="text" name="password"><br>
 <input type="submit" name="login" value="kirjaudu">
 </form>