php设计模式（工厂模式）

/*//设计模式：程序进行设计用的，工厂模式

class YunSuan {  public $a;  public $b;  public $f;    function Jia()  {   return ($this->a+$this->b);   }   function Jian()  {   return ($this->a-$this->b);   }   function Cheng()  {   return ($this->a*$this->b);   }   function Chu()  {   return ($this->a/$this->b);   }   function Yu()   {    return ($this->a%$this->b);    } }

$y = new YunSuan(); $y->a=10; $y->b=5; echo $y->Jia();*/ //造父类，用子类继承 class YunSuan {  public $a;  public $b;  function YunSuan()  {   }  }

//加法的子类  class Jia extends YunSuan  {   function YunSuan()   {    return ($this->a+$this->b);    }   } //剑法的子类  class Jian extends YunSuan  {   function YunSuan()   {    return ($this->a-$this->b);    }   }

$y = new Jia(); $y->a=10; $y->b=5; echo $y->YunSuan();

//再优化，工厂类    class GongChang  {   public static $f;   static function DuiXiang($f)   {    switch($f)    {     case "+":     return new Jia();     break;     case"-":     return new Jian();     break;     case"*":     return new Cheng();     break;     }    }   } $r =GongChang::DuiXiang("+"); $y->a=10; $y->b=5; echo $y->YunSuan();