I have installed Lampp on my linux system, and I am learning symfony2, while trying to create the schema with symfony2 command
php app/console doctrine:sche
if you are using XAMPP then in php.ini file line no 897(depends on version),
;extension=php_pdo_pgsql.dll
uncomment it , then it appears like below
extension=php_pdo_pgsql.dll
in php.ini file line no 897, then restart XAMPP.