We decided to finally remove support for PHP 5.3 in Kirby 2.2. PHP 5.3 is no longer maintained by the PHP core team, considered insecure and slow in comparison to more recent versions. Leaving this legacy behind will help us to build on a more solid ground.
We wanted to give you enough time to check your PHP versions before the update and maybe contact your hosting provider or sys admin. If your server still runs 5.3 please ask them to update. A good provider / sys-admin probably has already done that for you months ago. If your provider or sys admin is not able to update, you should honestly consider to change.
We think that this is a very important step in terms of security and also future options for Kirby and hope that it won’t result in too many problems for you.
Please send me an email if you have any questions: email@example.com