Follow along with the video below to see how to install our site as a web app on your home screen.
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If you are still using CentOS 7.9, it's time to convert to Alma 8 with the free centos2alma tool by Plesk or Plesk Migrator. Please let us know your experiences or concerns in this thread: CentOS2Alma discussion
I have CMS that supports PHP 5.6. But /forums/ section of this site can work maximum on PHP 5.3 (this is old IPB 2.1.7). All other parts of site work on modern CMS.
as vlikhtanskiy already stated, you can't use several PHP - versions on one domain/subdomain, but you certainly may use different PHP - versions on each domain/subdomain.
Consider to redirect "/forums/" to a new subdomain "forums.yourdomain.com" and use PHP 5.6 for yourdomain.com and PHP 5.3 for forums.yourdomain.com .
in such cases, please consider to do your OWN researches please, because correct 301-redirects on the same domain doesn't harm any ranking or traffic, nor does it harm your SEO.
It will help you to use as well the name "Matt Cutts" with your other search words, while using search engines for your research!