PMA\libraries\File::checkTblChangeForm PHP Method

    public function checkTblChangeForm($key, $rownumber)
    {
        if ($this->setUploadedFromTblChangeRequest($key, $rownumber)) {
            // well done ...
            $this->_error_message = null;
            return true;
        } elseif ($this->setSelectedFromTblChangeRequest($key, $rownumber)) {
            // well done ...
            $this->_error_message = null;
            return true;
        }
        // all failed, whether just no file uploaded/selected or an error
        return false;
    }