Description:
------------
Passing NULL via pg_query_params does not work resulting in situations where a possible NULL value must have a secondary branch of code to adjust the query accordingly.


Reproduce code:
---------------
Reproduce code:
---------------
using postgres 8x create this test table:

CREATE TABLE test
(
  id     serial PRIMARY KEY,
  name   text,
  extra  text,
);
INSERT INTO test (name,extra) VALUES ('Testing 123,'Testing');
INSERT INTO test (name) VALUES ('My extra is null');

<?php
$db = pg_connect("your connection string");

// query for all records where extra is NULL
IS NULL)
$res = pg_query_params("SELECT name FROM test WHERE extra=$1",array(NULL));

// print result, should be 'My extra is null'
print pg_fetch_result($res,0);
?>


Expected result:
----------------
pg_fetch_results should return the first result that matches the query and the code should print it.

Actual result:
--------------
The query does not run.