Laravel 5 - 在何处定义函数并在视图和控制器中调用它们

Question

我有以下功能，想从视图中调用它。基本上我想将所有常用功能放在一个文件中。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。

然后在其他控制器中我尝试按以下方式调用它：

use App\Http\Controllers\Common;

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

但我收到错误消息：

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

Answer 1

好的，新的尝试。您错过了使用完整的 class 名称并添加静态关键字：

<?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');
    }
}

另一个更面向对象的解决方案是使用来自父级的函数 class:

<?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');
    }
}

Laravel 5 - 在何处定义函数并在视图和控制器中调用它们

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