Detailed 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

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 ,

It can be used at this time. Suppose it is used in the controller

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 use

make 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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