Homebrewed http start fails on macOS Big Sur [closed]

I had installed Apache 2.4.46 on macOS Big Sur via Homebrew. It had worked fine until I did brew update and brew upgrade. At this time, PHP was upgraded from 7.4 to 8.0, so I modified httpd.conf as following.

#LoadModule php7_module /usr/local/opt/php/lib/httpd/modules/libphp7.so
#<IfModule php7_module>
#  AddType application/x-httpd-php .php
#</IfModule>
#Updated to PHP 8.0.0.1
LoadModule php_module /usr/local/opt/php/lib/httpd/modules/libphp.so
<FilesMatch \.php$>
    SetHandler application/x-httpd-php
</FilesMatch>

After that, I modified /usr/local/etc/php/8.0/php.ini as the same as /usr/local/etc/php/7.4/php.ini.

But brew services start htppd satys ==> Successfully started httpd (label: homebrew.mxcl.httpd), but brew services list shows httpd error MyUserName /Users/MyUserName/Library/LaunchAgents/homebrew.mxcl.httpd.plist.

So I stopped httpd service on brew and started as follows.

$ apachectl start
(48)Address already in use: AH00072: make_sock: could not bind to address 0.0.0.0:80
no listening sockets available, shutting down
AH00015: Unable to open logs

So, I can't continue to investigate furthermore.

Help, please.

Can you follow the instructions here:

https://stackoverflow.com/questions/64912014/mac-os-big-sur-homebrew-apache-48address-already-in-use-ah00072-make-sock

Hopefully you or someone else might find it useful