php链表

<?php

/**
 * @author MzXy
 * @copyright 2011
 * @param PHP链表
 */
/**
*
*节点类
*/
class Node
{
    private $Data;//节点数据
    private $Next;//下一节点
    public function setData($value){
        $this->Data=$value;
    }
    public function setNext($value){
         $this->Next=$value;
    }    
    public function getData(){
        return $this->Data;
    }
    public function getNext(){
        return $this->Next;
    }
    public function __construct($data,$next){
        $this->setData($data);
        $this->setNext($next);
    }
    
}//功能类
class LinkList
{
    private $header;//头节点
    private $size;//长度
    public function getSize(){
        $i=0;
        $node=$this->header;
        while($node->getNext()!=null)
        {   $i++;
            $node=$node->getNext();
        }
      return $i;
        
    }
    public function setHeader($value){
        $this->header=$value;
    }
    public function getHeader(){
        return $this->header;
    }
    public function __construct(){
         header("content-type:text/html; charset=utf-8");
        $this->setHeader(new Node(null,null));
    }
    /**
    *@author MzXy
    *@param  $data--要添加节点的数据
    * 
    */
    public function add($data)
    {
        $node=$this->header;
        while($node->getNext()!=null)
        {
            $node=$node->getNext();
        }
        $node->setNext(new Node($data,null));
    }
     /**
    *@author MzXy
    *@param  $data--要移除节点的数据
    * 
    */
    public function removeAt($data)
    {
        $node=$this->header;
        while($node->getData()!=$data)
        {
            $node=$node->getNext();
        }
        $node->setNext($node->getNext());
        $node->setData($node->getNext()->getData());
    }
     /**
    *@author MzXy
    *@param  遍历
    * 
    */
    public function get()
    {
        $node=$this->header;
        if($node->getNext()==null){
            print("数据集为空!");
            return;
        }
        while($node->getNext()!=null)
        {
            print($node->getNext()->getData());
            if($node->getNext()->getNext()==null){break;}
            $node=$node->getNext();
           
        }
       
    }
     /**
    *@author MzXy
    *@param  $data--要访问的节点的数据
    * @param 此方法只是演示不具有实际意义
    * 
    */
    public function getAt($data)
    {
        $node=$this->header->getNext();
          if($node->getNext()==null){
            print("数据集为空!");
            return;
        }
        while($node->getData()!=$data)
        {
            if($node->getNext()==null){break;}
            $node=$node->getNext();
        }
        return $node->getData();        
    }
     /**
    *@author MzXy
    *@param  $value--需要更新的节点的原数据  --$initial---更新后的数据
    * 
    */
    public function update($initial,$value)
    {
         $node=$this->header->getNext();
          if($node->getNext()==null){
            print("数据集为空!");
            return;
        }
        while($node->getData()!=$data)
        {
            if($node->getNext()==null){break;}
            $node=$node->getNext();
        }
         $node->setData($initial);     
    }
    
    
}

?>