你好，我按你视频里的方法写了代码，但是注册发送邮件的时候，显示500错误，这是为什么？

use Illuminate\Support\Facades\Mail;

private function sendTo($user,$subject,$view,$data = [])

{
    Mail::queue($view,$data,function($message) use ($user,$subject){
        $message->to($user->email)->subject($subject);
      
    });
}

请问在使用 Mail::queue时，要不要先配置 laravel 的队列？

我的版本是 5.2.22的，composer require laravelcollective/html 之后显示这个提示

Your requirements could not be resolved to an installable set of packages.

Problem 1

• Conclusion: remove laravel/framework v5.2.22

• Conclusion: don't install laravel/framework v5.2.22

• laravelcollective/html v5.4 requires illuminate/view 5.4.* -> satisfiable by illuminate/view[v5.4.0, v5.4.13, v5.4.9].

• laravelcollective/html v5.4.1 requires illuminate/view 5.4.* -> satisfiable by illuminate/view[v5.4.0, v5.4.13, v5.4.9].

• don't install illuminate/view v5.4.0|don't install laravel/framework v5.2.22

• don't install illuminate/view v5.4.13|don't install laravel/framework v5.2.22

• don't install illuminate/view v5.4.9|don't install laravel/framework v5.2.22

• Installation request for laravel/framework (locked at v5.2.22, required as 5.2.*) -> satisfiable by laravel/framework[v5.2.22].

• Installation request for laravelcollective/html ^5.4 -> satisfiable by laravelcollective/html[v5.4, v5.4.1].

Installation failed, reverting ./composer.json to its original content.

在使用composer require illuminate/html下载时，为什么会显示
Package illuminate/html is abandoned, you should avoid using it. Use laravelcollective/html instead.这样的信息？

你好，我看到视频中在生成测试数据的时候使用randomElement($user_ids)，想问一下randomElement()是什么意思？

Do not run Composer as root/super user! See https://getcomposer.org/root for details

laravel5.2中按标准的方法注册和登录用户，但错误提示是英文的，如何修改成中文提示，谢谢！

您好，请问在命令行输入 php artisan tinker 后，屏幕显示
[ErrorException]
exec() has been disabled for security reasons

是不是有哪个安全选项需要开启？

明白了，感谢！

请问 Laravel 中onDelete('cascade') 是什么意思？谢谢