<?php
/**
*工厂模式就是一种类，具有为您创建对象的某些方法，这样就可以使用工厂类创建对象，而不直接使用new。这样如果想更改创建的对象类型，只需更改工厂即可
*/
class Factory
{
???public static function create($type)
???{
???????switch ($type) {
???????????case ‘rect‘:
???????????????return new Rect();
???????????????break;
???????????case ‘triangle‘:
???????????????return new Triangle();
???????????????break;
???????????case ‘circular‘:
???????????????return new Circular();
???????????????break;
???????????defalut: ?
???????????????return null; ???????????????
???????????????break;
???????}
???}
}
abstract class Shape
{
???abstract public function Area();
}
class Rect extends Shape
{
???private $width;
???private $height;
???public function Area(){
???}
???public function __toString(){
???????return "矩形";
?????}
}
class Triangle extends Shape
{
???private $side1;
???private $side2;
???private $side3;
???public function Area(){
???}
?????public function __toString(){
???????return "三角形";
?????}
}
class Circular extends Shape
{
???private $radius;
???const PAI = 3.14;
???public function Area(){
???}
???public function __toString(){
???????return "圆形";
?????}
}
$obj = Factory::create(‘rect‘);
if($obj instanceof Shape){
echo $obj;
}else{
???exit("没有这个形状");
}
PHP 类工厂模式
原文地址：http://www.cnblogs.com/kuku2/p/7650090.html