/laravel IOC理解以及依赖注入

废话不说直接上实例

//laravelIOC理解以及依赖注入DIinterfaceSuperModuleInterface{/**
*超能力激活方法
*
*任何一个超能力都得有该方法，并拥有一个参数
*@paramarray$target针对目标，可以是一个或多个，自己或他人
*/
publicfunctionactivate(array$target);
}classXPowerimplementsSuperModuleInterface{publicfunctionactivate(array$target)
{//这只是个例子。。具体自行脑补
}
}/**
*终极炸弹（就这么俗）
*/classUltraBombimplementsSuperModuleInterface{publicfunctionactivate(array$target)
{//这只是个例子。。具体自行脑补
}
}classSuperman{protected$module;publicfunction__construct(SuperModuleInterface$module)
{$this->module=$module;
}
}classContainer{public$binds;public$instances;publicfunctionbind($abstract,$concrete)
{if($concreteinstanceofClosure){$this->binds[$abstract]=$concrete;
}else{$this->instances[$abstract]=$concrete;
}
}publicfunctionmake($abstract,$parameters=[])
{if(isset($this->instances[$abstract])){return$this->instances[$abstract];
}

array_unshift($parameters,$this);returncall_user_func_array($this->binds[$abstract],$parameters);
}
}//创建一个容器（后面称作超级工厂）$container=newContainer;//向该超级工厂添加超人的生产脚本$container->bind('superman',function($container,$moduleName){returnnewSuperman($container->make($moduleName));
});//向该超级工厂添加超能力模组的生产脚本$container->bind('xpower',function($container){returnnewXPower;
});//同上$container->bind('ultrabomb',function($container){returnnewUltraBomb;
});//******************华丽丽的分割线**********************//开始启动生产$superman_1=$container->make('superman',['xpower']);var_dump($container->binds);die;$superman_2=$container->make('superman',['ultrabomb']);$superman_3=$container->make('superman',['xpower']);var_dump($superman_1);die;//...随意添加

laravel核心就是服务容器.所有的服务提供者绑定到容器中.细致的讲解可以取作者的官网进行查看 整个IOC的核心应该是make方法的call_user_func_array()函数的调用

$container->bind('superman',$moduleName){returnnewSuperman($container->make($moduleName));
});

闭包函数

function($container,$moduleName){returnnewSuperman($container->make($moduleName));
}

恰好给call_user_fun_array()的第一个参数使用. 执行完三次bind之后,$container->bind中有了三个key->value的 闭包 当再次执行$container->make('superman',['xpower'])时,$container->binds中superman对应上述代码的闭包,参数为[$container,xpower] 执行 new Superman($container->make($moduleName))时,对应$container->make('xpower');则再次走call_user_func_array()的流程,return new xpower()给Superman的construst. 所以IOC实质就是2次调用call_user_func_array();

注:该代码引用自https://www.insp.top/article/learn-laravel-container