PHP extensions like Zend OPCache (former Zend Optimizer) and ionCube Loader are already pre-installed on all Web and Cloud hosting plans at Hostinger.

To enable them, go to Websites→ Manage, search for PHP Configuration on the left sidebar and click on it:

There, open the PHP extensions tab and mark the checkboxes for:

Scroll down to the bottom of the page and click on Save to apply the changes.