Linked List in PHP

linkedlist.php

<?php


class node {
	
	public $data;
	public $nextNode;
	
	public function __construct($data, $nextNode) {
		$this->data = $data;
		$this->nextNode = $nextNode;
	}
}

class LinkedList {
	
	
	public $firstNode;

	public function __construct($data) {
		
		$this->firstNode = new node($data, null);
	}
	
	function addNode($data) {
		
		// find last node
		$lastnode = $this->firstNode;
		while($lastnode->nextNode != null) {
			$lastnode = $lastnode->nextNode;
		}
		
		$newNode = new node($data, null);
		$lastnode->nextNode = $newNode;
		
	}
	
	function traverseList() {
		
		$nextNode = $this->firstNode;
		while($nextNode->nextNode != null) {
//			print "lol";
			print $nextNode->data;
			print "\n";
			
			$nextNode = $nextNode->nextNode;
			
			
		}
		
	}


}

$list = new LinkedList("lol");

$list->addNode("haha");
$list->addNode("yaya");
$list->addNode("foo");
$list->traverselist();