Accessing last inserted record in a PSQL Database table

I need to access the last inserted record in a postgresql database table from php. I connect to the db using pg_connect I construct the query string, and I use pg_query to send the query. I get the record inserted, of course. One of the fields, which is my primary key, is an autoincrement field. I need to fetch this value. Any idea? I would really apreciate your helping me.