<?php
$path = "shoe-for-ladies/high-hields/7-pont-with-silver-stripes-PD-0a8564q56";
preg_match('~-(NS|PD|SP)-([A-Za-z0-9]+)~', $path, $match);
PD9waHAKCiRwYXRoID0gInNob2UtZm9yLWxhZGllcy9oaWdoLWhpZWxkcy83LXBvbnQtd2l0aC1zaWx2ZXItc3RyaXBlcy1QRC0wYTg1NjRxNTYiOwpwcmVnX21hdGNoKCd+LShOU3xQRHxTUCktKFtBLVphLXowLTldKyl+JywgJHBhdGgsICRtYXRjaCk7CnByaW50X3IoJG1hdGNoKTs=