How do I: Insert Data into Profile Fields

[donottumbledry]

I need to insert data into user profile fields in PHP. The data is fully sanitised so I can use a direct mysql_query if needed.

I have searched high and low but cannot find anyone who has done this before :confused:

This is critical in what I need to achieve on the boards I am designing. A pre-built plug-in will not help as I am writing my own plug-in for a very specific task.