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class UserController extends Controller
{
    protected $db;

    public function __construct(Database $db)
    {
        $this->db = $db;
    }

    public function show($id)
    {
        $user = $this->db->find($id);

        return view('user.show', ['user' => $user]);
    }
}

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class DatabaseServiceProvider extends ServiceProvider
{
    public function register()
    {
        $this->app->singleton(Database::class, function ($app) {
            return new Database(
                $app->make(PDO::class),
                $app->config->get('database')
            );
        });
    }
}

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