本质是将 Laravel 框架中的类复制到 Lumen 中，并进行注册。
bootstrap/app.php
require_once __DIR__ . '/helpers/functions.php';bootstrap/helpers/functions.php
/**
* 设置 public_path 方法
*/
if (!function_exists('public_path')) {
/**
* Return the path to public dir
* @param null $path
* @return string
*/
function public_path($path = null)
{
return rtrim(app()->basePath('public/' . $path), '/');
}
}app/Console/Commands/StorageLinkCommand.php
<?php
namespace App\Console\Commands;
use Illuminate\Console\Command;
class StorageLinkCommand extends Command
{
/**
* The console command signature.
*
* @var string
*/
protected $signature = 'storage:link';
/**
* The console command description.
*
* @var string
*/
protected $description = 'Create a symbolic link from "public/storage" to "storage/app/public"';
/**
* Execute the console command.
*/
public function handle()
{
// 创建 storage 文件夹
if (!file_exists(storage_path('app/public'))) {
mkdir(storage_path('app/public'));
}
// 如果软链接已存在则不再创建
if (file_exists(public_path('storage'))) {
return $this->error('The "public/storage" directory already exists.');
}
// 创建软链接
$this->laravel->make('files')->link(
storage_path('app/public'), public_path('storage')
);
$this->info('The [public/storage] directory has been linked.');
}
}