Use PHP-FPM instead of mod_php

[jamesmontalvo3]

From https://www.mediawiki.org/wiki/Manual:Performance_tuning

if you use Apache as web server, use PHP-FPM, not mod_php. PHP-FPM optimizes re-use of PHP processes.
switch Apache to use the event MPM instead of the prefork MPM.

[jamesmontalvo3]

I briefly tried PHP-FPM while trying to figure out #995. These articles were helpful:

• Sort of this one: https://www.stephenrlang.com/2018/02/centos-7-apache-2-4-with-php-fpm/
• I did some of this: http://cheesefather.com/2017/09/centos-7-apache-with-php-7-1-and-fcgid/
• Ultimately I added proxypassmatch from this: https://github.com/geerlingguy/ansible-role-apache-php-fpm
• In retrospect, could it have been this simple: https://www.server-world.info/en/note?os=CentOS_7&p=httpd&f=19

My final proxypassmatch:

ProxyPassMatch ^/(.*\.php(/.*)?)$ "unix:/run/php-fpm/www.sock|fcgi://localhost/opt/htdocs/$1"

However, this didn't take into account required rewrite rule:

RewriteRule ^(?!mediawiki(?:/|$))[^/]+(?:/(.*))?$ mediawiki/$1

Make sure to yum install php70u-fpm

Was this necessary? I did it: yum install mod_fcgid

I may have edited all of these:

/etc/httpd/conf.modules.d/10-php.conf
/etc/httpd/conf.d/php.conf
/etc/php-fpm.d/www.conf