Installing zeromq extension

i am quite confused on how to get get zeromq extension working. i believe i pointed to the correct path in my php.ini file, but there is another file ( libzmq.dll ) that i don’t know where to put. i am on windows and the original instructions for zmq are here (scroll to windows section):

i’ve followed the instructions here: How do I compile additional PHP extensions?

and tried another extension’s instructions that were similar: Installing ChartDirector PHP extension

but it did not work as it does not show in the php_info.php