Max Upload File Size Filter

<?php

/*
|--------------------------------------------------------------------------
| Max Upload File Size filter
|--------------------------------------------------------------------------
|
| Check if a user uploaded a file larger than the max size limit.
| This filter is used when we also use a CSRF filter and don't want
| to get a TokenMismatchException due to $_POST and $_GET being cleared.
|
*/
Route::filter('maxUploadFileSize', function()
{
    // Check if upload has exceeded max size limit
    if (! (Request::isMethod('POST') or Request::isMethod('PUT'))) { return; }
    // Get the max upload size (in Mb, so convert it to bytes)
    $maxUploadSize = 1024 * 1024 * ini_get('post_max_size');
    $contentSize = 0;
    if (isset($_SERVER['HTTP_CONTENT_LENGTH']))
    {
        $contentSize = $_SERVER['HTTP_CONTENT_LENGTH'];
    } 
    elseif (isset($_SERVER['CONTENT_LENGTH']))
    {
        $contentSize = $_SERVER['CONTENT_LENGTH'];
    }
    // If content exceeds max size, throw an exception
    if ($contentSize > $maxUploadSize)
    {
        throw new GSVnet\Core\Exceptions\MaxUploadSizeException;
    }
});

Thx to you Mark for that great snippet.
About making it work for Laravel 5, a better idea will be to create a Middleware, with your code in the handle() method.
Except you'll have to change the first test in :

if(!(request()->isMethod('POST') || request()->isMethod('PUT'))) { return $next($request); }

After then, you just have to register it in kernel.php. By the way, you need it to run before the VerifyCsrfToken middleware.
So register it in the 'web' group, just before the Csrf line.
Ok, this is a bit "overkill" for the most part of cases, but imo that's the most elegant way to do.