table with two fields (f1,f2) where the primary key are both fields.

pg_connect("dbname=xxx port=5432");
sql1="insert into table values (1,1)";
sql2="insert into table values (1,2)";

pg_exec($conn,$sql);
pg_exec($conn,$sql2);

the first pg_exec inserts values 1,0 and the second one tries to insert values 1,0 and produces a duplicate entry warning.

I installed from rpm's, the ones that comes with redhat 6.2