• Laravel Version: 5.4.24
• PHP Version: 7.0
• Database Driver & Version: MySQL 5.7

Description:

I ran into a bug regarding cookies that's directly related to a recent update of the symfony/http-foundation package: 3.2.9 -> 3.3.0. I think I found the pull request that's responsible for this as well.
The problem occurs when putting array values in a Cookie and attaching it to the response headers.

Steps To Reproduce:

code:

<?php
namespace App\Controllers;

class CookieController
{
    public function createCookie()
    {
        $array = array(0 => 1);
        $cookie = cookie('array', $array, 0);
        return response(['message'], 200)->withCookie($cookie);
    }
}

1. make sure you update your packages with composer and "symfony/http-foundation": 3.3.* is installed;
2. test the above code using a route to the above controller and action method;
3. an exception occurs saying:

 [Symfony\Component\Debug\Exception\FatalErrorException]                      
  Method Symfony\Component\HttpFoundation\Cookie::__toString() must not throw  
   an exception, caught ErrorException: Array to string conversion 

The code above is a simple as I can reproduce the code I have in my production application. I've tested the same code using a fixed dependency to "symfony/http-foundation": 3.2.* and the code runs without a problem.
I don't have enough deep knowledge of symfony to suggest a fix. But maybe another contributor understand what's going on here. I'm using this code since Laravel 4.2 and always worked.

Let me know if I need to elaborate some more!

Thomas,