<?php class LinkTester extends Structures_LinkedList_DoubleNode { protected $_my_number; function __construct($num) { $this->_my_number = $num; } function getNumb() { return $this->_my_number; } function setNumb($numb) { $this->_my_number = $numb; } } $tester1 = new LinkTester(1); $tester2 = new LinkTester(2); $tester3 = new LinkTester(3); $tester4 = new LinkTester(4); $tester5 = new LinkTester(5); $tester6 = new LinkTester(6); ?>