IOC容器实现基本步骤
能够实现以上目标的就是IOC容器,可以把IOC容器简单的看成一个全局变量,并用关联数组把字符串和构造函数做绑定。
我们先实现一个容器类
class Container{ public $bindings; public function bind($abstract,$concrete){ $this->bindings[$abstract]=$concrete; } public function make($abstract,$parameters=[]){ return call_user_func_array($this->bindings[$abstract],$parameters); } }
服务注册(绑定)
$container=new Container(); $container->bind('db',function($arg1,$arg2){ return new DB($arg1,$arg2); }); $container->bind('session',function($arg1,$arg2){ return new Session($arg1,$arg2); }); $container->bind('fs',function($arg1,$arg2){ return new FileSystem($arg1,$arg2); });
容器依赖
class Writer{ protected $_db; protected $_filesystem; protected $_session; protected $container; public function Writer(Container $container){ $this->_db=$container->make('db',[1,2]); $this->_filesystem=$container->make('session',[3,4]); $this->_session=$container->make('fs',[5,6]); } } $writer=new Writer($container);