PHP设计模式 ?单例模式与工厂模式

//设计模式
//1、单例
//类的计划生育
//1、让该类在外界无法造对象
//2、让外界可以造一个对象，做一个静态方法返回对象
//3、在类里面通过静态变量控制 只有一个

class Cat{
 ???public $name;

 ???private function __construct()
 ???{
 ???}

 ???static $temp;
 ???static function new_ob(){
 ???????if(empty(self::$temp)){
 ???????????self::$temp = new Cat();
 ???????}
 ???????return self::$temp;
 ???}

 ???function speak(){
 ???????return"喵喵喵喵喵";
 ???}
}

$mao = Cat::new_ob();
$mao2 = Cat::new_ob();

$mao->name = "abc";
echo $mao2->name;



//$mao;
//if(empty($mao)){
// ???$mao = new Cat();
//}
//
//$xxx = $mao;



//工厂模式
//class Jsq
//{
// ???public $a;
// ???public $b;
//
// ???public function jiafa(){
// ???????return $this->a + $this->b;
// ???}
//}

abstract class Jsq{
 ???public $a;
 ???public $b;
 ???function yunsuan(){

 ???}
}

class Jiafa extends Jsq{
 ???function yunsuan(){
 ???????return $this->a + $this->b;
 ???}
}
class Jianfa extends Jsq{
 ???function yunsuan(){
 ???????return $this->a - $this->b;
 ???}
}
//$j1 = new jiafa();
//$j1->a = 1;
//$j1->b = 2;
//$j1->yunsuan();

class Factory{
 ???static function creat($x){
 ???????switch ($x){
 ???????????case "+":
 ???????????????return new Jiafa();
 ???????????????break;
 ???????????case "-": ???????????????return new Jianfa(); ???????????????break; ???????} ???}}$jf = Factory::creat("+");$jf->a = 1;$jf->b = 2;echo $jf->yunsuan();

PHP设计模式 ?单例模式与工厂模式

原文地址：http://www.cnblogs.com/little-rock/p/7682589.html