Question:

Creating a service in Laravel using app(FQCN)

Solution

The best part about Laravel is that it automatically resolves the Service that you want it to perform. The following code is the best example of this:

class ExampleController

{

// The ExampleService will be automatically resolve

public function __construct(ExampleService $service) {}

}

The app() helper resolves that class if you pass in a FQCN as a parameter, but it returns an instance of Laravel Container otherwise:

app(); // it will return a instance of container

app()->make(Filter::class); // it will resolve the Filter::class

app(Filter::class); // ^ the same as the above

If you want to bind a service class to an interface let's say:

interface House {}

class AncientHouse implements House {}

class HouseBuiler

{

public function __construct(House $house) {}

}

Binding the House interface to the ServiceProvider enables the Container to infer that you want to inject the AncientHouse class, even if you don't want to use the exact AncientHouse class.

Within the AppServiceProvider's register() method

public function register()

{

$this->app->bind(House::class, AncientHouse::class);

}

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