abstract class AbstractClass {
    protected abstract function foo($data);

    public function __construct($param) {
         self::foo($param);
    }
}

class ConcreteClass extends AbstractClass {
    public $propertie;

    protected function foo($data) {
         $this->propertie = $data;
    }
}

$fa = new ConcreteClass('banana');
echo $fa->propertie;