Sinterclass in PHP Class

<?php
DEFINE("klaas", "klaas");
class Sinter {
 public $ophef; // Publieke ophef
 public $sint;
 function __construct($klaas) {
  $this->ophef = 0x5a . 0x77 . 0x61 . 0x72 . 0x74 . 0x65; // ophef over Zwarte Piet
  $this->sint = $klaas; // Klaas is de Sint
 }
 public function klaas() {
  return $this->sint; // Return this Sint
 }
 public function piet() {
  $result = "";
  $o = $this->ophef;
  $result = chr($o[0].$o[1]) . chr($o[2].$o[3].$o[4]) . chr($o[5].$o[6]) . chr($o[7].$o[8].$o[9]) . chr($o[10].$o[11].$o[12]) . chr($o[13].$o[14].$o[15]);
  return $result . " " .__FUNCTION__;
 }
}

$sint = new Sinter(klaas); // Sint is Sinterklaas
echo get_class($sint).$sint->klaas()." en ".$sint->piet(); // Get klaas, Sint -> Piet