<?php
$monthNum = 6;
$dateObj = DateTime::createFromFormat('m', $monthNum);
$dateObj->setTimezone(new DateTimeZone('America/Sao_Paulo'));
$monthName = $dateObj->format('M');
echo $monthName;
PD9waHAKCgokbW9udGhOdW0gID0gNjsKJGRhdGVPYmogICA9IERhdGVUaW1lOjpjcmVhdGVGcm9tRm9ybWF0KCdtJywgJG1vbnRoTnVtKTsKJGRhdGVPYmotPnNldFRpbWV6b25lKG5ldyBEYXRlVGltZVpvbmUoJ0FtZXJpY2EvU2FvX1BhdWxvJykpOwokbW9udGhOYW1lID0gJGRhdGVPYmotPmZvcm1hdCgnTScpOwplY2hvICRtb250aE5hbWU7Cg==