Hello! I want to thank everyone who replied to my question. I managed to solve my problem. I followed Tomas' suggestion and added '::text' to query string. Ultimately, however, the problem was that the function existed in another schema. (Thanks, Tom, for pointing me to this direction!) What I did was to add another pg_query, just before the "main" query: pg_query($yhteys, "SET search_path TO htyo;"); That did the trick! Again, thanks for saving me hours of frustration. Tuo -- Sent via pgsql-general mailing list (pgsql-general@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general