Is it okay to upgrade to PHP 5.5.12 from PHP 5.5.1? [closed]

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Currently my production servers have PHP 5.5.1 installed and working fine.

PHP 5.5.1 (cli) (built: Jan 14 2014 11:37:09)

Copyright (c) 1997-2013 The PHP Group

Zend Engine v2.5.0, Copyright (c) 1998-2013 Zend Technologies

However according to this post PHP has released 5.5.12 to fix some OpenSSL issues. We are running on CodeIgniter.

As I see there is no breaking change between 5.5.1 and 5.5.12, only bug fixes and few additions. So it should be fine to upgrade PHP version smoothly.

However recently we also upgraded to newer version of OpenSSL avoid heartbleed bug. So now is it necessary to upgrade the PHP for same reasons?

If I am not missing anything then upgrade won't cause any version related issue?

NOTE: As the post mentions the example of shared hosting/servers, we have our own multiple dedicated servers running behind load balancers.

Answer 1

PHP releases avoid any type of syntax-breaking changes at the minor-version-release level, so as long as you're still PHP 5.5 your code will almost certainly still be valid. Since you have multiple servers, you could try upgrading one of them, completing your test suite/unit test/basic sanity tests/etc. first before rolling out the upgrade to all your servers.

You could spend a lot of time poring through the diffs on the commits referenced in that post, but ultimately you may find a move from 5.5.1 to 5.5.12 is fairly safe and may yield other improvements too, so I'd focus your energy on testing.