Get last id in postgresql

Hi all, I´m starting with posgresql and i trying to use pg_last_oid to get the last id in a insert query, but this function returns me a big number like 21318 and bigger, but the table just have 3 or 4 records. Could some one help? Any ideas? This is the script i´m using $insert = "insert into test(name) values('myname')"; $test = pg_exec($insert); echo $id = pg_last_oid($test); Norma Ramirez norma.ramirez@tecnosoft.com.co