Explain Contextual Binding and how does it work

Question

Sometimes we may have two classes that utilize the same interface, but we wish to inject different implementations into each class.

How can this be possible?? Can anyone explain me out??

Thank You!

Answer 1

Hello,

Sometimes you may have two classes that utilize the same interface, but you wish to inject different implementations into each class. 

For example, two controllers may depend on different implementations of the Illuminate\Contracts\Filesystem\Filesystem contract. Laravel provides a simple, fluent interface for defining this behavior:

use Illuminate\Support\Facades\Storage;
use App\Http\Controllers\PhotoController;
use App\Http\Controllers\VideoController;
use Illuminate\Contracts\Filesystem\Filesystem;

$this->app->when(PhotoController::class)
->needs(Filesystem::class)
->give(function () {
return Storage::disk(‘local’);
});

$this->app->when(VideoController::class)
->needs(Filesystem::class)
->give(function () {
return Storage::disk(‘s3’);
})

The above code will allow you to have two class that utilize the same interface.

Thank You!