Codeception/Codeception — pull request #1438 by kkopachev (2014-10-03 20:09:33+00:00)
Title: Client connector trait to convert request params and files into PHP form

PHP has very strange format for $_FILES superglobal array if form field name contains square brackets. This code convert BrowserKit\Client files format into PHP-compatible one.
PHP request parameters and files high-level names can not contain dots or spaces and PHP converts all of them into underscores. So we have to convert all that as well.