This update broke my pihole web interface.
Upgrade went fine - no errors reported, but parts of the web interface would throw errors and not load.
A look through the logs found
2022-09-05 05:32:19: (mod_fastcgi.c.421) FastCGI-stderr: PHP Parse error: syntax error, unexpected 'const' (T_CONST), expecting variable (T_VARIABLE) in /var/www/html/admin/scripts/pi-hole/php/database.php on line 285
2022-09-05 05:32:28: (mod_fastcgi.c.421) FastCGI-stderr: PHP Parse error: syntax error, unexpected 'const' (T_CONST), expecting variable (T_VARIABLE) in /var/www/html/admin/scripts/pi-hole/php/database.php on line 285
2022-09-05 05:32:32: (mod_fastcgi.c.421) FastCGI-stderr: PHP Parse error: syntax error, unexpected 'const' (T_CONST), expecting variable (T_VARIABLE) in /var/www/html/admin/scripts/pi-hole/php/database.php on line 285
My raspberry pi was running PHP 7.0
I upgraded to PHP 7.3 by doing an apt-install for the 7.3 version of all installed 7.0 packages
sudo apt install php7.3-cgi php7.3-cli php7.3-common php7.3-intl php7.3-json php7.3-opcache php7.3-readline php7.3-sqlite3 php7.3-xml
One reboot later - and it's all working again.
Did I miss a dependency requirement for something newer than PHP7.0 in the current (or previous) release notes