class bar
{
        public function setup_pins($port_no, $units)
        {
                for ($i = 0; $i < $this->pin_qty[$port_no]; $i++)
                {
                        echo "Setting up pin " . $i . "\n";
                        $this->pin[$i] = new Pin;
                        if ($port_no > 3)
                        {
                                $this->pins = 8;
                        }
                        else
                        {
                                $this->pins = 1;
                        }
                        $this->pin[$i]->setup_unit($i, $units);
                }
        }
}

class Pin
{
       public function setup_unit($pin_no, $units)
       {
                $this->do_counter();
                echo "Setting up unit " . $units[$this->c] . "\n";
                $this->set_bitmask($pin_no);
                $this->set_unit_no($units[$this->c]);
                $this->create_call_file($units[$this->c]);
        }

        public function do_counter()
        {
                if (! isset($this->c))
                {
                        $this->c = 0;
                        echo "Not set\n";
                }
                else
                {
                        $this->c++;
                        echo "C is " . $this->c . "\n";
                }
        }
}