PHP編程
 <?php 
  
 /** 
  * 抽象狀態類 
  * @author wzy 
  * 
  */ 
 interface VoteState 
 { 
  
  /** 
   * 需要實現的公共辦法 
   */ 
  public function vote (); 
 } 
  
 /** 
  * 具體狀態――正常投票 
  * 
  * @author wzy 
  *   
  */ 
 class NormalVoteState implements VoteState 
 { 
  
  public function vote () 
  { 
   echo "這是一個正常投票!"; 
  } 
 } 
  
 /** 
  * 具體狀態――惡意投票 
  * 
  * @author wzy 
  *   
  */ 
 class RepeatVoteState implements VoteState 
 { 
  
  public function vote () 
  { 
   echo "這是一個惡意投票!"; 
  } 
 } 
  
 /** 
  * 具體狀態――黑名單投票 
  * 
  * @author wzy 
  *   
  */ 
 class BlockVoteState implements VoteState 
 { 
  
  public function vote () 
  { 
   echo "這是一個黑名單投票!"; 
  } 
 } 
  
 /** 
  * Context角色 
  */ 
 class VoteManager 
 { 
  
  /** 
   * 投票數量 
   * 
   * @var int 
   */ 
  private $vote_count; 
  
  /** 
   * 狀態類實例 
   * 
   * @var object 
   */ 
  private $voteInstance; 
  
  /** 
   * 構造函數,初始化成員屬性 
   * 
   * @param int $count    
   */ 
  public function __construct ($count = 1) 
  { 
   $this->vote_count = $count; 
  } 
  
  /** 
   * 客戶端調用的接口函數 
   */ 
  public function setState ($count) 
  { 
   if (! is_null($count)) { 
    $this->vote_count = $count; 
   } 
   if ($this->vote_count < 5) { 
    $this->voteInstance = new NormalVoteState(); 
   } else 
    if ($this->vote_count < 8) { 
     $this->voteInstance = new RepeatVoteState(); 
    } else { 
     $this->voteInstance = new BlockVoteState(); 
    } 
    
   $this->voteInstance->vote(); 
  } 
 } 
  
 /** 
  * 模擬客戶端操作 
  */ 
  
 $object = new VoteManager(); 
 $object->setState(1); 
 echo "<br>"; 
 $object->setState(6); 
 echo "<br>"; 
 $object->setState(10);