Beware of isset though. A field with just a space entered will count as being "set", so you have to always use preg_match afterwards.
You have to validate each field. Not only to see if it was filled out or not, but also so malicious data isn't submitted. Use preg_match with an...
I think it would be pretty awesome and useful if users had the opportunity to enter their paypal email in their profile so we wouldn't always have...
I think he meant databases. If so, you're going to have to select a database, execute query, select the second database, execute query, and so on.
Separate names with a comma.