Debian 11 Bullseye
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Apache2 : PHP + PHP-FPM2021/09/07

 
Install PHP-FPM (FPM : FastCGI Process Manager) to make PHP scripts be fast.
[1]
[2] Install PHP-FPM.
root@www:~#
apt -y install php-fpm
[3] Add Settings in Virtualhost you'd like to set PHP-FPM.
root@www:~#
vi /etc/apache2/sites-available/default-ssl.conf
# add into <VirtualHost> - </VirtualHost>

    <FilesMatch \.php$>
        SetHandler "proxy:unix:/var/run/php/php7.4-fpm.sock|fcgi://localhost/"
    </FilesMatch>
</VirtualHost>

root@www:~#
a2enmod proxy_fcgi setenvif

Considering dependency proxy for proxy_fcgi:
Enabling module proxy.
Enabling module proxy_fcgi.
Module setenvif already enabled
To activate the new configuration, you need to run:
  systemctl restart apache2

root@www:~#
a2enconf php7.4-fpm

Enabling conf php7.2-fpm.
To activate the new configuration, you need to run:
  systemctl reload apache2

root@www:~#
systemctl restart php7.4-fpm apache2
[4] Create [phpinfo] in Virtualhost's web-root you set PHP-FPM and access to it, then it's OK if [FPM/FastCGI] is displayed.
root@www:~#
echo '<?php phpinfo(); ?>' > /var/www/html/info.php

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