[PHP] 理解依赖注入容器
2023-02-18 15:41:26 时间
容器就是个存东西的地方
依赖注入,就是通过构造函数,属性或者set方法传递对象的方式
如果依赖的类太多了,那么通过上面的方式传递对象就很繁琐
那么我们就可以直接传进去一个容器,需要的时候就在容器里面去拿就简单多了
这就是我们的容器类
//简单容器类 class Container { private $s=array(); function __set($k, $c) { $this->s[$k]=$c; } function __get($k) { return $this->s[$k]($this); } }
User类里面需要使用Book和Goods对象,在容器里创建后,在User类里面只需要直接拿就可以了
class User{ private $c; public function __construct(Container $c) { $this->c=$c; } public function doBook(){ $this->c->book->toDo(); } public function doGoods(){ $this->c->goods->toDo(); } } class Book{ public function toDo(){ echo "do book\n"; } } class Goods{ public function toDo(){ echo "do goods\n"; } } $c=new Container(); $c->book=function(){ return new Book(); }; $c->goods=function(){ return new Goods(); }; $user=new User($c); $user->doBook(); $user->doGoods();
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