So have installed PHP8.1 from ondrej PPA
sudo add-apt-repository ppa:ondrej/php
Install PHP8.1
sudo apt install php8.1-fpm
sudo apt install php8.1
sudo apt install php8.1-intl
sudo apt install php8.1-mbstring
sudo apt install php8.1-mysql
sudo apt install php8.1-xml
sudo apt install php8.1-zip
sudo apt install php8.1-opcache
sudo apt install php8.1-curl
sudo apt install php8.1-mailparse
sudo apt install php8.1-imagick
# or for greater brevity with bash shell
sudo apt install php8.1-{fpm,intl,mbstring,curl,mailparse,imagick,zip,xml,mysql}
The first thing I found is that /etc/php/8.1/fpm/php-fpm.conf is missing when I try to start the php8.1-fpm.service
# copy it from 8.0 and edit
cp /etc/php/8.0/fpm/php-fpm.conf /etc/php/8.1/fpm/php-fpm.conf
# find and replace all instances of 8.0 with 8.1 then
systemctl enable php8.1-fpm.service
systemctl start php8.1-fpm.service
The next challenge is when trying to enable the needed extensions. I get these errors
phpenmod -v 8.1 intl
WARNING: Module intl ini file doesn't exist under /etc/php/8.1/mods-available
WARNING: Module intl ini file doesn't exist under /etc/php/8.1/mods-available
The fix is copying the ini files to the mods-available directory to make them available to php8.1-fpm
Find and enable the PHP extensions you need
WordPress docs has a list of recommended extensions => https://make.wordpress.org/hosting/handbook/server-environment/
cp /usr/share/php8.1-mysql/mysql/*.ini /etc/php/8.1/mods-available
phpenmod -v 8.1 mysqli
phpenmod -v 8.1 mysqlnd
phpenmod -v 8.1 pdo_mysql
cp /usr/share/php8.1-opcache/opcache/opcache.ini /etc/php/8.1/mods-available/
phpenmod -v 8.1 opcache
cp /usr/share/php8.1-common/common/* /etc/php/8.1/mods-available/
phpenmod -v 8.1 ctype
# repeat for all your needed modules & restart
systemctl restart php8.1-fpm.service
To find out what is missing browse your WordPress site and trigger errors. You might see error screens like the following:
The emails sent to your site admin email address will contain hints as to what's missing. The following says I'm missing the ctype extension
To see the PHP extensions you have enabled
ls -1 /etc/php/8.1/fpm/conf.d/
10-mysqlnd.ini
10-opcache.ini
20-ctype.ini
20-curl.ini
20-gd.ini
20-imagick.ini
20-intl.ini
20-mbstring.ini
20-mysqli.ini
20-pdo_mysql.ini
20-soap.ini
20-tidy.ini
20-zip.ini
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