memcached

Hi guys

Ive followed this tut to install memcached https://devblog.plesk.com/2015/08/adding-custom-php-modules-in-plesk/ everything has installed just fine and i can see memcached in tools & settings/php settings. but its not showing in phpinfo.php?

CentOS 6.8
php 5.6.72

any help is much appreciated