PHP FrameworkLaravelDetailed explanation of the relationship between Contracts, ServiceContainer, ServiceProvider and Facades in laravelDetailed explanation of the relationship between Contracts, ServiceContainer, ServiceProvider and Facades in laravel
Contracts, ServiceContainer, ServiceProvider, Facades
1.Contracts Contract , the contract, that is, the interface, defines some rules, and everyone who implements this interface must implement the methods inside;
2.ServiceContainer, implement Contracts, specifically Logical implementation;
3.ServiceProvider, the service provider of serviceContainer, returns the instantiation of ServiceContainer for use elsewhere, you can Add it to the provider of app/config, and it will be automatically registered in the container;
4.Facades, simplifyServiceProvider calling method, and can statically call the methods in ServiceContainer;
implementation
ContractsThe interface can be written or not, and will not be defined here;
Define a ServiceContainer to implement specific functions
namespace App\Helper;
class MyFoo
{
public function add($a, $b)
{
return $a+$b;
}
}
Define a ServiceProvider for use elsewhere ServiceContain
<?php
namespace App\Providers;
use App\Helper\MyFoo; //要服务的Container
use Illuminate\Support\ServiceProvider;
use App;
class MyFooServiceProvider extends ServiceProvider
{
public function boot(){}
//注册到容器中
public function register()
{
//可以这么绑定,这需要use App;
App::bind("myfoo",function(){
return new MyFoo();
});
//也可以这么绑定
$this->app->bind("myfoo", function(){
return new MyFoo();
});
}
}
at## Add ServiceProvider to the providers array in #app/config.php to allow the system to automatically register
App\Providers\MyFooServiceProvider::class ,
public function two($id=null)
{
//从系统容器中获取实例化对象
$myfoo = App::make("myfoo");
echo $myfoo->add(1,2);
} This is too troublesome, and you still need to usemake To get the object, for simplicity, you can use the facade function, define the facade MyFooFacade
namespace App\Facades;
use Illuminate\Support\Facades\Facade;
class MyFooFacade extends Facade
{
protected static function getFacadeAccessor()
{
//这里返回的是ServiceProvider中注册时,定义的字符串
return 'myfoo';
}
} and you can call it directly in the controller use App\Facades\MyFooFacade;
public function two($id=null)
{
//从系统容器中获取实例化对象
$myfoo = App::make("myfoo");
echo $myfoo->add(1,2);
//使用门面
echo MyFooFacade::add(4,5);
} In general, after customizing a class, in order to facilitate its use elsewhere, you can use service providers and facades. Recommended: "laravel tutorial"
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