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 /**
  * ¼òµ¥¹¤³§Ä£Ê½(Simple Factory Pattern),¾ßÌåÖ¸´´½¨Ò»¸öÀàËÆÓÚ¹¤³§µÄÀ࣬ͨ¹ý¶ÔÀàÖгÉÔ±·½·¨µÄµ÷Ó÷µ»Ø²»Í¬µÄ¶ÔÏó
  * ¸ÃģʽµÄºËÐÄÊǹ¤³§À࣬¸ÃÀàÖк¬ÓбØÒªµÄÅжÏÂß¼­£¬¿ÉÒÔ¾ö¶¨ÔÚʲôʱºò´´½¨²¢·µ»ØÄĸö²úÆ·µÄʵÀý»¯¶ÔÏó
  */
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 abstract class Product
 {
  abstract function getName();
 }
 //¶¨Òå¾ßÌå²úÆ·ÀàA
 class ProductA extends Product
 {
  public function getName()
  {
   echo "I am product A";
  }
 }
 //¶¨Òå¾ßÌå²úÆ·ÀàB
 class ProductB extends Product
 {
  public function getName()
  {
   echo "I am product B";
  }
 }
 //¶¨Ò幤³§Àà
 class ProductFactory
 {
  static function create($name)
  {
   switch($name)
   {
    case "A":
     return new ProductA();
    case "B":
     return new ProductB();
   }
  }
 }
 $product=ProductFactory::create("A");
 $product->getName();
 echo "<br/>";
 $product=ProductFactory::create("B");
 $product->getName();
 /**
  * µ¥ÔªËØÄ£Ê½(Singleton Pattern)ÊÇÖ¸¶ÔÖ¸¶¨µÄÀàÖ»ÄÜʵÀý»¯Ò»´Î¡£
  * ¸Ãģʽͨ³£°üº¬Ò»¸ö˽Óй¹Ôì·½·¨£¬ÓÃÀ´È·±£ÎÞ·¨Í¨¹ý´´½¨¶ÔÏó»òÕ߿ˡµÄ·½Ê½¶ÔÆä½øÐÐʵÀý»¯
  * ¸Ãģʽ»¹°üº¬ÓÐÒ»¸ö˽Óо²Ì¬ÊôÐԺ͹«Óо²Ì¬·½·¨¡£
  * ¹«Óо²Ì¬·½·¨¸ºÔð¶ÔÆä±¾Éí½øÐÐʵÀý»¯£¬¶øË½Óо²Ì¬ÊôÐÔ¸ºÔð´æ´¢ÊµÀý»¯µÄ¶ÔÏó¡£
  */
 class Singleton
 {
  private static $ins


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