//Paypalcontrol
        $paypal = new paypal();
        $paypal->setVariable = $variable;

        // Paypal
        protected $variable;
        public function setVariable($variable){
            $this->variable = $variable;
            // Deze lijn is niet veprlicht
            return $this;
        }
        public function getVariable(){
            return $this->variable;
        }

        // Nu kun je in paypal.php dus jou variable aanspreken met
        $this->getVariable() of $this->variable;