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I need to upgrade my PHP installation on CentOS 6 from 5.3 to 5.5. While I have a couple of webprojects running I like first to install the new PHP in parallel and switch back to the old one if problems are occurring.

  • How do I install PHP 5.5 on CentOS in parallel and keep the old one?
  • How do I configure Apache to take the new PHP instance?
  • Is there a possibility on Apache to specify for each virtual host which PHP instance has to be taken?
  • How do I uninstall the old version?
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I found a couple of tutorials which shows how this can be achieved:

solution 1 - using fast cgi instead of mod_php

solution 2 - runn a single instance of Apache, and run one instance of PHP as a module, and other installs as CGI.

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  • Can you please incorporate some of the details from those links in your A? Link only A's is discouraged since links often become stale and/or broken over time, in which case your A becomes useless to future passer-bys.
    – slm ♦
    Sep 18, 2014 at 15:26

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