laenge = 2; $this->breite = 4; } function umfang(){ $u = 2*$this->laenge + 2*$this->breite; return $u; } function flaeche(){ $f = $this->laenge*$this->breite; return $f; } } $r = new Rechteck(); $url = rawurlencode(serialize($r)); echo "weiter"; ?>