Where do I download PHP extensions for windows?

I'm trying to make my PHP installation to work with PostgreSQL, so I need php_pgsql.dll

A very dumb question, but where do I get one for my PHP5.3?

I have read here: http://php.net/manual/en/install.windows.extensions.php, but it is said that, yes, you need this dll, but no download link. What am I missing?

dll is开发者_Python百科 not present by default in my installation:

extension is in ext subdirectory, to activate it you have to edit php.ini, set ext dir and uncomment php_pgsql