BUG #6550: Querry failed while using throung php program.

The following bug has been logged on the website:

Bug reference: 6550
Logged by: M K Krishnan
Email address: mkkrish(at)hotmail(dot)com
PostgreSQL version: 9.0.4
Operating system: Windows 7
Description:

11Variety One Warning: pg_query(): Query failed: ERROR: syntax error at or
near "and" LINE 1: select * from variety_dir where crop_cd= and variety_cd=1
^ in C:\Program Files
(x86)\PostgreSQL\EnterpriseDB-ApachePhp\apache\www\agrimetnew\variety_upd.php
on line 32 Warning: pg_num_rows() expects parameter 1 to be resource,
boolean given in C:\Program Files
(x86)\PostgreSQL\EnterpriseDB-ApachePhp\apache\www\agrimetnew\variety_upd.php
on line 33 No Record Found .

Query works from SQL Screen. When uses through php it fails.