PHP實現(xiàn)鏈表的定義與反轉功能示例

?php
class Node
{
  private $Data;//節(jié)點數(shù)據(jù)
  private $Next;//下一節(jié)點
 
  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);
  }
}
class LinkList
{
  private $header;//頭節(jié)點
  private $size;//長度
  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 $data--要添加節(jié)點的數(shù)據(jù)
  * 
  */
  public function add($data)
  {
    $node=$this->header;
    while($node->getNext()!=null)
    {
      $node=$node->getNext();
    }
    $node->setNext(new Node($data,null));
  }
   /**
  *@author MzXy
  *@param $data--要移除節(jié)點的數(shù)據(jù)
  * 
  */
  public function removeAt($data)
  {
    $node=$this->header;
    while($node->getData()!=$data)
    {
      $node=$node->getNext();
    }
    $node->setNext($node->getNext());
    $node->setData($node->getNext()->getData());
  }
   /**
  *@author MzXy
  *@param 遍歷
  * 
  */
  public function get()
  {
    $node=$this->header;
    if($node->getNext()==null){
      print("數(shù)據(jù)集為空!");
      return;
    }
    while($node->getNext()!=null)
    {
      print('['.$node->getNext()->getData().'] -> ');
      if($node->getNext()->getNext()==null){break;}
      $node=$node->getNext();
    }
  }
   /**
  *@author MzXy
  *@param $data--要訪問的節(jié)點的數(shù)據(jù)
  * @param 此方法只是演示不具有實際意義
  * 
  */
  public function getAt($data)
  {
    $node=$this->header->getNext();
  if($node->getNext()==null){
      print("數(shù)據(jù)集為空!");
      return;
    }
    while($node->getData()!=$data)
    {
      if($node->getNext()==null){break;}
      $node=$node->getNext();
    }
    return $node->getData();    
  }
   /**
  *@author MzXy
  *@param $value--需要更新的節(jié)點的原數(shù)據(jù) --$initial---更新后的數(shù)據(jù)
  * 
  */
  public function update($initial,$value)
  {
     $node=$this->header->getNext();
 if($node->getNext()==null){
     print("數(shù)據(jù)集為空!");
      return;
    }
    while($node->getData()!=$data)
    {
      if($node->getNext()==null){break;}
      $node=$node->getNext();
    }
 $node->setData($initial);   
  }
}
$lists = new LinkList();
$lists -> add(1);
$lists -> add(2);
$lists -> get();
echo 'pre>';
print_r($lists);
echo '/pre>';
?>

function ReverseList($pHead)
{
  // write code here
  if($pHead == null || $pHead->next == null){
    return $pHead;
  }
  $p = $pHead;
  $q = $pHead->next;
  $pHead->next = null;//$pHead 變?yōu)槲仓羔?
  while($q){
    $r = $q->next;
    $q->next = $p;
    $p = $q;
    $q = $r;
  }
  return $p;
}

function ReverseList($pHead)
{
  // write code here
  if($pHead == null || $pHead->next == null){
    return $pHead;
  }
  $res = ReverseList($pHead->next);
  $pHead->next->next = $pHead;
  $pHead->next = null;
  return $res;
}