sys_get_temp_dir

<?php                     $parsedBody = [];

                    foreach ($document->getParts() as $part) {

                        if ($part->isFile()) {

                            $tmpPath = tempnam(sys_get_temp_dir(), 'bref_upload_');

                            if ($tmpPath === false) {

                                throw new RuntimeException('Unable to create a temporary directory');

                            }