Hi List, Can anyone recommend a good PHP function/class to generate GUIDs? I'm shifting from using auto-increment to using GUIDs - any advice for this type of change? Does a SQL lookup slow down using a GUID as a PK versus using an integer as a PK? Thanks! Kirk Ouimet <mailto:kirk at kirkouimet.com> kirk at kirkouimet.com Cell: (801) 310-1421