<?php
$ID = '3803_452.jpg';
$id = $partes[0];
$seq = $partes[1];
echo $id; // 3803
echo $seq; // 452.jpg
PD9waHAKCiRJRCA9ICczODAzXzQ1Mi5qcGcnOwokcGFydGVzID0gZXhwbG9kZSgnXycsICRJRCk7CgokaWQgPSAkcGFydGVzWzBdOwokc2VxID0gJHBhcnRlc1sxXTsKJHNlcSA9IHN1YnN0cigkc2VxLCAwLCBzdHJwb3MoJHNlcSwgJy4nKSk7CmVjaG8gJGlkOyAvLyAzODAzCmVjaG8gJHNlcTsgLy8gNDUyLmpwZw==