PostgreSQL, exception and PHP

Hello,

is here somebody who works with PostgreSQL in PHP? I have a PL/SQL
function, which can raise an exception. I am not able to catch _only_
exception error message in PHP. I can parse "Warning: pg_query():
Query failed: ERROR: Exception error string. in..." but I think, it is
not "clear" solution. Thank you for your reply.

--
Jiri Nemec