I need to know whether there is a php_pgsql.dll equivalent package for linux OS or not. I have searched in web but i could find only the pdo-pgsql package. I require php_pgsql driver as in windows.
Since you're using RedHat, you can use the Remi repo, which includes builds for all the latest versions of PHP.
The package you want is called php-pgsql
yum install php-pgsql