Laravel 5-在哪里定义函数并在视图中调用它们&；控制器 - Laravel 5 - Where to define functions and call them in views & controllers

Laravel 5 - Where to define functions and call them in views & controllers

我有以下函数，希望从视图中调用它。基本上，我想把所有常见的函数放在一个文件中。我不确定在哪里创建该文件，以及如何在控制器和视图中调用它。

<?php namespace App'Http'Controllers;
use App'Http'Controllers'Controller;
use DB;
class CommonController extends Controller {
public function BytesToMB($bytes=0)
{
    if(empty($bytes))
    return 0;
    $kb = ceil($bytes/1024);
    $mb = ceil($kb/1024);
    return $mb;
}
}

到目前为止，我已经在app/Http/Controllers中创建了CommonController.php，并将上面的函数放入其中

然后在另一个控制器中，我试着用以下方式调用它：

use App'Http'Controllers'Common;
class SongsController extends Controller {
    public function index($id)
    {
       echo Common::BytesToMB('7012187');
    }
}

但我得到了错误：

 Class 'App'Http'Controllers'Common' not found

好的，新的尝试。您错过了使用完整的类名并添加静态关键字：

<?php 
namespace App'Http'Controllers;
use App'Http'Controllers'Controller;
use DB;
class CommonController extends Controller {
    public static function BytesToMB($bytes=0)
    {
        if(empty($bytes))
        return 0;
        $kb = ceil($bytes/1024);
        $mb = ceil($kb/1024);
        return $mb;
    }
}

然后：

<?php
namespace App'Http'Controllers;
// You do not need to define this, if you are in the same namespace
use App'Http'Controllers'CommonController;
class SongsController extends Controller {
    public function index($id)
    {
       echo CommonController::BytesToMB('7012187');
    }
}

另一个更OOP的解决方案是使用父类中的函数：

<?php 
namespace App'Http'Controllers;
use App'Http'Controllers'Controller;
use DB;
class CommonController extends Controller {
    protected function BytesToMB($bytes=0)
    {
        if(empty($bytes))
        return 0;
        $kb = ceil($bytes/1024);
        $mb = ceil($kb/1024);
        return $mb;
    }
}

然后：

<?php
namespace App'Http'Controllers;
// You do not need to define this, if you are in the same namespace
use App'Http'Controllers'CommonController;
class SongsController extends CommonController {
    public function index($id)
    {
       echo $this->bytesToMB('7012187');
    }
}