<?php
$dia = 12;
$mes = 5;
$ano = 2016;
$date = new DateTime();
$date->setDate( $ano, $mes, $dia );
echo $date->format('d/m/Y');
?>
PD9waHAKCgkkZGlhID0gMTI7CgkkbWVzID0gNTsKCSRhbm8gPSAyMDE2OwoKCSRkYXRlID0gbmV3IERhdGVUaW1lKCk7CgkkZGF0ZS0+c2V0RGF0ZSggJGFubywgJG1lcywgJGRpYSApOwoJCgllY2hvICRkYXRlLT5mb3JtYXQoJ2QvbS9ZJyk7Cgo/Pgo=