1) under mandatory extensions, it lists (amongst others): date, hash, json, pcre, Reflection, session

a) date, hash, pcre: are now part of PHP, see:
<https://wiki.php.net/rfc/permanent_hash_ext>
<https://www.php.net/manual/en/pcre.installation.php>

Would be nice if the Guide said they are only needed for PHP < x.y.z.

b) the Reflection extension I can't even find in the FreeBSD ports collection... so far, not having it has not caused me any problems yet.

c) the filter extension seems to also be required, without it I get this in my apache error log:

[Tue Dec 22 16:04:01.105980 2020] [php7:error] [pid 83333] [client 10.1.1.120:51580] PHP Fatal error: Uncaught Error: Call to undefined function filter_var() in /usr/local/etc/apache24/mantest.rogue-research.com/bugs/config_defaults_inc.php:219\nStack trace:\n#0 /usr/local/etc/apache24/mantest.rogue-research.com/bugs/core.php(94): require_once()\n#1 /usr/local/etc/apache24/mantest.rogue-research.com/bugs/index.php(31): require_once('/usr/local/etc/...')\n#2 {main}\n thrown in /usr/local/etc/apache24/mantest.rogue-research.com/bugs/config_defaults_inc.php on line 219

Its requirement should be documented.