If you want to extend an existing Windows WAMP installation with a PostgreSQL database execute the following steps:
Apache 2.2.X configuration
Add the next line to the Apache 2.2.x httpd.conf configuration:
LoadFile “C:/Program Files/PostgreSQL/9.1/bin/libpq.dll”
Above line must be entered before the next line.
LoadModule php5_module “c:/wamp/bin/php/php5.2.11/php5apache2_2.dll”
PHP 5.2.X Configuration
Enable (remove trailing ; character) the following two lines in the php.ini configuration file.
extension=php_pdo_pgsql.dll
extension=php_pgsql.dll
Restart WAMP
Restart the wamp (apache, php and mysql) software.
Test
Create the following test.php file and place it in the apache www root directory:
<?php
echo extension_loaded('pgsql') ? 'yes':'no';
?>
When the php file is executed (http://127.0.0.1/test.php) in apache the following information must be showed on screen.
yes