<?php

class User {

	/**
	 * @param $password
	 * @return bool
	 */
	public function validatePassword($password)
	{
	    return (strcmp($password, $this->getPassword() === 0));
	}
	
	public function getPassword()
	{
		return "123";
	}
	
}

$user = new User;

if($user->validatePassword("пароль")) {
	
	echo 'Вы успешно авторизованы';
}