<?php
/**
* <p>Title: Double linked list</p>
* <p>Description: Implementation of a double linked list in PHP</p>
* @author Oddleif Halvorsen | leif-h@online.no
* @version 1.2
*/
class ListNode{
var $previousNode;
var $nextNode; //a reference to the next node
var $element; //the object || value for this node.
/**
* Constructs a ListNode.
* @param $element The object/value of the node
*/
function ListNode($element = NULL){
$this->element = &$element;
}
/**
* Sets the reference to the previous node.
* @param &$node The previous node.
*/
function setPrevious($node){
$this->previousNode = &$node;
}
/**
* Sets the reference to the next node.
* @param &$node The next node.
*/
function setNext($node){
$this->nextNode = &$node;
}
/**
* Returns the reference to the previous node.
* @return The reference to the previous node.
*/
function &getPrevious(){
return $this->previousNode;
}
/**
* Returns the reference to the next node.
* @return The reference to the next node.
*/
function &getNext(){
return $this->nextNode;
}
/**
* Returns the object/value of the node
* @return The object/value of the node
*/
function getNodeValue(){
return $this->element;
}
}
?>
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