Description:
------------
If in PostgreSQL stored function I make raise exception, when I call it by pg_query, I have PHP WARNING. But try-catch block doesn't work. 


Reproduce code:
---------------
try
{
  $this->resultID = pg_query($this->connectID, $this->query);
}
catch (Exception $e)
{
  $this->dieDB($e);
}

Expected result:
----------------
Catched exception in var $e

Actual result:
--------------
Warning:  pg_query(): Query failed: ERROR:  PASSWORD_WRONG#users# in /xxx/dbi.class.php on line 175.