DGS Search running under PHP 4 and 5

Hi!
We are currently using DGS Search under PHP 3 on Windows 9x but we are moving to PHP 4 (maybe PHP 5) under Windows XP. Is DGS Search working under that? If not, is there a lot of changes to be done on the code? Thank you for sharing your experience!
We are currently using DGS Search under PHP 3 on Windows 9x but we are moving to PHP 4 (maybe PHP 5) under Windows XP. Is DGS Search working under that? If not, is there a lot of changes to be done on the code? Thank you for sharing your experience!