Description:
------------
Having Windows 2000 SP4, 
PHP 4.3.4, php_interbase latest checked from CVS (Revision 1.91.2.26). Firebird SS 1.0.3

Having a table in db (dialect 3):

CREATE TABLE T_TEST (
    F1  TIMESTAMP NOT NULL,
    F2  INTEGER
);

and a trigger associated with it:

CREATE TRIGGER T_TEST_BI0 FOR T_TEST
ACTIVE BEFORE INSERT POSITION 0
AS
begin
  if (new.f1 IS null) then
    new.f1 = current_timestamp;
end

This mean that no record will be inserted with F1 set to NULL. Having code reproduced below I get a message:
Warning: ibase_query(): Parameter 90206904 must have a value in c:\g2\htdocs\ibase_not_null.php on line 7

The problem seems to lie around lines 1199-1202 in interbase.c

Reproduce code:
---------------
<?php
$G2db = ibase_connect( '/path/to/db', 
		       'user', 'passw', 
		       'WIN1251', 0, 3, 'role');
$G2tr = ibase_trans(IBASE_NOWAIT, $G2db);

$qry = ibase_query($G2tr, 'insert into t_test (f1, f2) values (?, ?)', NULL, '33');

ibase_commit($G2tr);
ibase_close($G2db);
?>

Expected result:
----------------
PHP shouldn't complain at all.