PHP extensions are not loading to the client site

Hello good afternoon.
After following this tutorial completely: https://www.howtoforge.com/tutorial...l-pureftpd-bind-postfix-doveot-and-ispconfig/ I accessed ispconfig, I created a client and then a site for this client and so far everything works perfectly, but this client executes the APCu extension in the site's cach by php cli, and here I realized the problem.

if I type "php -m" as root in the shell, all the php extensions including APC and APCu will appear, but if I type php -m with the client's user shell, only the basic php modules will appear.
How can I solve this?