/**
     * Verifica daca parola indeplineste cerintele
     *
     * @param string $password
     * @return integer Numarul de criterii pe care il indeplineste. Trebuie sa fie 4 pentru o parola valida.
     */
    private function checkPass($password)
    {
        $strength = 0;
        $patterns = array('#[a-z].*[a-z]#','#[A-Z].*[A-Z]#','#[0-9].*[0-9]#','#[!@\#$%^&*()\{\}\[\]<>?+_\/].*[!@\#$%^&*()\{\}\[\]<>?+_\/]#');
        foreach($patterns as $pattern)
        {
            if(preg_match($pattern,$password,$matches))
            {
                $strength++;
            }
        }
        return $strength;
    }