protected function get_new_id()
{
if (!file_exists("particle/")) {
return 0;
}
$files = array();
$iterator = new FilesystemIterator("particle/", FilesystemIterator::SKIP_DOTS);
while ($iterator->valid()) {
array_push($files, $iterator->getFileName());
$iterator->next();
}
if (sizeof($files) == 0) {
return 0;
}
natsort($files);
$lastFile = end($files);
$name = explode(".", $lastFile);
return intval($name[0]) + 1;
}