Contracts, ServiceContainer, serviceprovider, facades relations in Laravel

contracts, ServiceContainer, serviceprovider, facades

1. Contracts contract, contract, that is, interface, define some rules, each implementation of this interface to implement the method inside
2. ServiceContainer implementation of contracts, concrete logic implementation
3. ServiceProvider ServiceContainer service provider, returns the instantiation of the ServiceContainer for use elsewhere, can be added to App/config provider, will be automatically registered in the container
4. Facades simplifies the way serviceprovider is called, and can call methods in ServiceContainer statically

Implement contracts interface can write or not write, here does not define a servicecontainer to achieve the specific function

namespace App\helper; class myfoo{    publicfunction Add ($a$b)    {          return$a+$b;    }}

Define a serviceprovider for other places to use Servicecontain

<?phpnamespace app\providers; UseApp\helper\myfoo;//the container to serve UseIlluminate\support\serviceprovider; UseApp;classMyfooserviceproviderextendsserviceprovider{ Public functionboot () {}//registering in a container     Public functionRegister () {//can be so binding, which requires use of the App;App::bind ("Myfoo",function(){            return NewMyfoo ();        }); //can also be so binding        $this->app->bind ("Myfoo",function(){            return NewMyfoo ();    }); }}

 Add serviceprovider to the providers array in app/config.php to let the system register automatically

App\providers\myfooserviceprovider::class,

It can be used at this time, assuming that the controller uses

 Public function ($id=null) {    // Get instantiated object from System container    $ Myfoo = App::make ("Myfoo");     Echo $myfoo->add;}

This is too cumbersome, you need to use make to get objects, for the sake of simplicity, you can use the façade function, define the façade Myfoofacade

namespace App\facades;  Use Illuminate\support\facades\facade; class extends facade{    protectedstaticfunction  getfacadeaccessor ()    {         // return here is serviceprovider when registering, define the string        return ' Myfoo ';}    }

You can call it directly in the controller.

 Use App\facades\myfoofacade;  Public function ($id=null) {    // Get instantiated object from System container    $ Myfoo = App::make ("Myfoo");     Echo $myfoo->add ();     // using the façade    Echo Myfoofacade::add (4,5

In general, a class has been customized so that service providers and facades can be used in order to make them easier to use elsewhere

Contracts, ServiceContainer, serviceprovider, facades relations in Laravel