Controllers validate method returns converted keys

[nicoeg]

• Laravel Version: 5.7
• PHP Version: 7.*
• Database Driver & Version: Not used

Description:

When having request input arrays which keys contains . it is converted to -> when using data returned from the validate method in a Controller.

Since #25128 the Illuminate\Foundation\Validation\ValidatesRequests::validate method returns the input data directly from the validator instead of fetching it from the request. This means that the str_replace done in Illuminate\Validation\Validator:parseData to convert . to -> is also returned.

I don't believe that this is expected behaviour.
Possible solution would be to convert back -> before returning but then existing input keys containing -> would also be affected.
Either the validate method could be changed back to fetch data from the request or the dot's should be replaced with something less likely of occurring?

Steps To Reproduce:

Basic controller:

<?php

namespace App\Http\Controllers;

use Illuminate\Http\Request;

class TestController extends Controller
{
    public function index(Request $request) {
        $validated = $this->validate($request, ['*' => 'required']);
        return $validated;
    }
}

Route:

Route::get('/', 'TestController@index');

Go to the page with the following query string ?nested[config.conf]=gsdggdfg

[driesvints]

We don't support dot notation in keys anymore sorry.