public function __construct($x = 0, $y = 0, $z = 0)
{
$this->x = $x;
$this->y = $y;
$this->z = $z;
}
public function __construct($x, $y, $z, $id, $class, $data) { parent::__construct($x, $y, $z); $this->id = $id; $this->class = $class; $this->data = $data; }