php單例模式與原廠模式

標籤：原廠模式   this   靜態   ati   return   單例模式   private   cas   一個   

//單例模式
//1.將建構函式變成私人的
//2.提供一個靜態方法來返回對象
//3.在方法裡加限制條件
//class ren{
//public $name;
//public static $dx;
//private function __construct(){
//}
//public static function duixiang(){
//if(empty(ren::$dx)){
//ren::$dx=new ren();
//}
//return ren::$dx;
//}
//}
//$r=ren::duixiang();
//$r->name="張三";
//$r=ren::duixiang();
//var_dump($r);
//原廠模式
//class YunSuan{
//public $a;
//public $b;
//public function suan(){
//}
//}
//class Jia extends YunSuan{
//public function suan(){
//return $this->a+$this->b;
//}
//}
//class Jian extends YunSuan{
//public function suan(){
//return $this->a-$this->b;
//}
//}
//class Yu extends YunSuan{
//public function suan(){
//return $this->a%$this->b;
//}
//}
//class GongChang{
//public static function duixiang($ysf){
//switch($ysf){
//case "+":
//return new Jia();
//break;
//case "-":
//return new Jian();
//break;
//case "%":
//return new Yu();
//break;
//}
//}
//}
//$y = GongChang::duixiang("-");
//$y->a = 10;
//$y->b = 5;
//echo $y->suan();

php單例模式與原廠模式