mysql_insert_id

I know how to use but I had a question. There is an interesting comment in the php manual about having a database which the primary field is NOT called id. Then you insert a record, get a number back and then that is an id number. now if the primary is an int that is fins - say it is a string. How do you reference the retured id back to the database record if the primary key is not returned because it is a string.

Interesting
wondered if anyone here had any ideas?

mysql_insert_id() only works on auto_increment fields, which need to be numeric and the primary key. So I think the case you're describing is not even possible...