Facades:不应静态调用非静态方法

我创建了一个类和门面,如下所示:

Invoice.php(正面/Invoice.php)

<?php

namespace app\Facades\;

use Illuminate\Support\Facades\Facade;

class Invoice extends Facade
{
   protected static function getFacadeAccessor()
   {
        //NEVER CALLED
        dd("TEST");

        return 'invoice';
    }
}
?>

invoiceFacadeServiceProviders.php

<?php

namespace App\Providers;

use App;
use Illuminate\Support\ServiceProvider;

class InvoiceFacadesServiceProvider extends ServiceProvider
{
   public function boot()
   {
      //
   }
   public function register()
   {
      App::bind('invoice',function()
      {
         return new \App\Invoice\Invoice;
      });
   }
}
?>

最后是课程本身:

<?php


namespace App\Invoice;

class Invoice
{
    public function testfunc()
    {
        return "This is a test";
    }
}
?>

在控制器中,我尝试使用如下类来测试它:

use App\Invoice\Invoice;

调用testfunc方法:

dd(Invoice::testfunc());

在 app.php 我添加了以下(提供程序): App\Providers\InvoiceFacadesServiceProvider::class, 和(别名): 'invoice' => App\Facades\Invoice::class,

但我只得到:

Non-static method App\Invoice\Invoice::testfunc() should not be called statically.

我还注意到 getFacadeAccessor() 方法不会被激发,因为它没有命中 dd 我已经放在那里了。

我错过了什么?

感谢您的帮助和指导!