If user ID exists in database, UPDATE. Otherwise, INSERT (HELP)

[eluser]Barwick[/eluser]
[quote author="CroNiX" date="1352170165"]replace always does a delete and then an insert, so it basically always acts as an insert since it deletes the existing row if it exists. Still a little more overhead (2 operations) than ON DUPLICATE KEY UPDATE.[/quote]

Haha, yeah I don't like the sounds of delete THEN ask questions later. I've read some horror stories pertaining to this.