Hi, here is what my code looks like

i have two forms:

class Form_1 extends Form_Abstract {

    public $iId = 1;

}
class Form_2 extends Form_1 {

    public $iId = 2;

}

i expect the code behave like this:

$oForm = new Form_2;
echo $oForm->getId(); // it returns '2'
echo $oForm->getParentId(); // i expect it returns '1'

here is my Form_Abstract class:

class Form_Abstract {

    public $iId = 0;

    public function getId() {
        return $this->iId;
    }

/**
this method will be called from a child instance
*/
    public function getParentId() {
        return parent::$iId;
    }
}

but it throws a Fatal Error:

Fatal error: Cannot access parent:: when current class scope has no parent

please help me with the method getParentId()