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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。

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/**

 * 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。

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<&#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。

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<&#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:

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<&#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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