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Laravel中注册Facades的步骤详解_PHP

May 28, 2016 am 11:48 AM
laravel

本文讲述了Laravel中注册Facades的步骤。分享给大家供大家参考,具体如下:

在Laravel中将类注册为Fcade可以使用Ioc容器,每次使用这个类的时候只会初始化一次类,类似单例模式,而且可以像使用静态方法调用类的方法,下面是在Laravel中注册Facades的步骤。

1.在项目app目录的Providers/AppServiceProvider.php中的register方法新增方法,代码如下。

/**
 * Register any application services.
 *
 * @return void
 */
public function register()
{
 $this->registerTestModel();
}
private function registerTestModel()
{
 $this->app->singleton('testmodel', function ($app) {
  $model = 'App\Models\Test';
  return new $model();
 });
 $this->app->alias('testmodel', 'App\Models\Test');
}

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这里把命名空间是App\Models的Test类注册为单例模式,并且取个别名testmodel.这个Test类的文件位置app/Models/Test.php.

2.建立一个Facade类

在项目根目录app\Facades目录新增文件,如Test.php,代码如下,目录不存在可以新建一个。

<&#63;php
namespace App\Facades;
use Illuminate\Support\Facades\Facade;
class Test extends Facade
{
 /**
  * Get the registered name of the component.
  *
  * @return string
  */
 protected static function getFacadeAccessor()
 {
  return 'testmodel';
 }
}

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通过继承Facade,重载getFacadeAccessor方法,返回之前绑定的单例模式的类的别名。

3.使用Facade

经过前面的步骤后,可以使用Test这个Facade了,如下示例是在控制器中使用Facade的方式。

<&#63;php
namespace App\Http\Controllers;
use App\Facades\Test;
use Illuminate\Routing\Controller;
class TestController extends Controller
{
 public function __construct()
 {
  Test::show();
  Test::show();
 }
}

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先看看这个原始类Test.php的内容:

<&#63;php
namespace App\Models;
use Illuminate\Database\Eloquent\Model;
class Test extends Model
{
 protected $table = 'tt';
 public static $times = 0;
 public function __construct()
 {
  self::$times++;
  parent::__construct();
 }
 public function show()
 {
  echo self::$times . '<br>';
 }
}

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经过注册Facade后,调用show方法就是Test::show()的形式,并且类似单例模式不会多次实例化,调用也十分简单。

PS:以上仅为注册Facade的方法和步骤,实际项目中可能还需对Model层进行进一步的封装。

转自:小谈博客 http://www.tantengvip.com/2016/01/laravel-facades-register/

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希望本文所述对大家基于Laravel框架的PHP程序设计有所帮助。

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