OpenBSD 6.9 and PHP version

[Steve Williams]

Hi,

When I upgraded to OpenBSD 6.9 then did the pkg_add -u, I got 
php-php-7.4.18 installed.

How do I know if it's "safe" to delete the old php-7.3.28 and all the 
associated modules?

I know I'll have to migrate my ".ini" file changes to the new version 
for both php and php_fpm, but other than that, how do I figure out if 
anything is still calling 7.3?

I have a simple build, roundcubemail, piwigo, nextcloud and a few others.

Thanks,
Steve W.