laravel控制器中的全局變量

Question

我希望$year變量可用於我的所有函數PagesController。我試過這段代碼，但我沒有成功。

class PagesController extends Controller 
{ 
    public function __construct() 
    { 
     $dt = Carbon::parse(); 
     $year = $dt->year; 
    } 

    public function index() 
    { 
     return view('pages.index'); 
    } 

    public function about() 
    { 
     return view('pages.about', compact('year')); 
    } 

    public function create() 
    { 
     return view('pages.create', compact('year')); 
    } 
} 

Answer 1

1.選擇：使用AppServiceProvider

在這種情況下$年可用於所有視圖！

<?php 

namespace App\Providers; 

use Carbon; 

class AppServiceProvider extends ServiceProvider 
{ 
    /** 
    * Bootstrap any application services. 
    * 
    * @return void 
    */ 
    public function boot() 
    { 
     view()->share('year', Carbon::parse()->year); 
    } 

    /** 
    * Register the service provider. 
    * 
    * @return void 
    */ 
    public function register() 
    { 
     // 
    } 
} 

2.選項：使用View Composer

在這種情況下，該變量是隻提供給在你需要它的意見。

不要忘了添加新創建的提供商到config/app.php！

<?php 

namespace App\Providers; 

use Illuminate\Support\ServiceProvider; 
use Carbon; 

class ComposerServiceProvider extends ServiceProvider 
{ 
    /** 
    * Register bindings in the container. 
    * 
    * @return void 
    */ 
    public function boot() 
    { 
     // Using Closure based composers... 
     view()->composer('pages.*', function ($view) { 
      $view->with('year', Carbon::parse()->year); 
     }); 
    } 

    /** 
    * Register the service provider. 
    * 
    * @return void 
    */ 
    public function register() 
    { 
     // 
    } 
} 

3.使用刀片@inject-method

在需要一年你可以注入碳例如像這樣的觀點：

@inject('carbon', 'Carbon\Carbon') 

{{ $carbon->parse()->year }} 

Answer 2

試試這個：

//give private declaration 
private $year; 
public function __construct() 
{ 
    $dt = Carbon::parse(); 
    $this->year = $dt->year; 
} 

public function index() 
{ 
    return view('pages.index'); 
} 

public function about() 
{ 
    $year = $this->year; 
    return view('pages.about',compact('year')); 
} 

public function create() 
{ 
    $year = $this->year; 
    return view('pages.create',compact('year')); 
} 

Answer 3

可以事前內的應用程序：創建一個全球性的單

App::before(function($request) { 
    App::singleton('customYear', function(){ 
     $dt = Carbon::parse(); 
     $customYear = $dt->year; 
     return $customYear; 
    }); 

    // If you use this line of code then it'll be available in any view 
    View::share('customYear', app('customYear')); 

    //To get the same data in any controller you may use: 
    $customYear = app('customYear'); 
});