在 Laravel Facades 中使用静态变量
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Use static variables in Laravel Facades
提问by Kousha
I have a Facade (in this case a singleton) and I register it using a ServiceProvider:
我有一个 Facade（在本例中为单例），我使用以下命令注册它ServiceProvider：
Service Provider
服务提供者
use App;
class FacilityServiceProvider extends ServiceProvider
{
public function register()
{
$this->app->singleton('Facility', function(){
return new Facility();
});
// Shortcut so developers don't need to add an Alias in app/config/app.php
$this->app->booting(function()
{
$loader = \Illuminate\Foundation\AliasLoader::getInstance();
$loader->alias('Facility', 'CLG\Facility\Facades\FacilityFacade');
});
}
}
Facade
正面
use Illuminate\Support\Facades\Facade;
class FacilityFacade extends Facade {
/**
* Get the registered name of the component.
*
* @return string
*/
protected static function getFacadeAccessor() { return 'Facility'; }
}
Now, I want to have static variables inside my Facilityclass:
现在，我想在我的Facility班级中有静态变量：
Facility.php
设施.php
class Facility
{
public static $MODEL_NOT_FOUND = '-1';
public function __construct() { ... }
}
but when I use Facility::$MODEL_NOT_FOUND, I get Access to undeclared static property.
但是当我使用时Facility::$MODEL_NOT_FOUND，我得到Access to undeclared static property.
What am I doing wrong?
我究竟做错了什么？
回答by lukasgeiter
That's because the Facade class only "redirects" method calls to the underlying class. So you can't access properties directly. The simplest solution is using a getter method.
那是因为 Facade 类只将方法调用“重定向”到底层类。所以你不能直接访问属性。最简单的解决方案是使用 getter 方法。
class Facility
{
public static $MODEL_NOT_FOUND = '-1';
public function __construct() { ... }
public function getModelNotFound(){
return self::$MODEL_NOT_FOUND;
}
}
The alternative would be to write your own Facade class that extends from Illuminate\Support\Facades\Facadeand make use of magic methodsto access properties directly
另一种方法是编写您自己的 Facade 类，该类扩展自Illuminate\Support\Facades\Facade并利用魔术方法直接访问属性
