Change OPcache interned strings buffer size globally

Prologue

In some cases you may need to define a higher interned_strings_buffer than given by the default PHP configuration.

You can create a file in the mods-available folder and enable it.

The only downside to this is, if you install a newer PHP version, you might have to repeat the process.

/etc/php/8.1/mods-available/local-opcache.ini

1 opcache.interned_strings_buffer=16

Enable it with following command:

phpenmod local-opcache
# You may need to restart your services to make this work.
# systemctl restart apache2
# systemctl restart php8.1-fpm.service