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What PHP version would you recommend for running CiviCRM version 4.6.8?
I was using an old version of PHP (4.3.3), but that is no longer sufficient to run CiviCRM and 5.4+ is recommended in the documentation. Would it be wise to upgrade to the latest version 5.6.13 or might I be safer with something like 5.5.29?
The safest bet is probably 5.5. 5.6 ought to work but hasn't been tested as thoroughly. As a core CiviCRM developer I currently use 5.5.9 in my test environment.
You should also look at which version is recommended for your CMS, often that is more of a limiting factor.
