How to Disable OPcache for WHMCS Print

Some WHMCS installations may display a system-health warning when PHP OPcache is enabled.

1. In Plesk, open the domain that hosts WHMCS and go to PHP Settings.
2. Use the domain-level PHP configuration where possible so unrelated websites are not affected.
3. Set opcache.enable=0. If required for CLI jobs, also set opcache.enable_cli=0.
4. Apply the changes and verify the active setting from the PHP information page.

Only change PHP settings when you understand their effect on other applications using the same PHP handler.