public static function makeSerialNumber($str)
{
if ($str) {
//get just the last segment if it includes directory path
$str = array_pop(explode('/', $str));
$str = preg_replace('/[^a-zA-Z0-9_-]/', '_', trim($str));
$str = trim(preg_replace('/__*/', '_', $str), '_');
return Dase_Util::truncate($str, 50);
} else {
return null;
}
}
