Centos backports any security fixes, so there’s no real concern there.
Maintaining backwards compatibility is definitely up to you — but for me, it’s an easy choice between an incompatible plug-in and avoiding a forced complete update of my (multiple sites’) server’s operating environment.
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This reply was modified 8 years, 4 months ago by jhfrontz.
Note that on Centos 6 (in maintenance mode until 2020), php 5.3 is the latest stock version. For a lot of us on virtual servers, Centos 6 is still considered “current”.