PHP 5.3 has been upgraded to 5.3.29 on all of our servers. This is the final release of PHP 5.3 and marks its end of life. As such, in the coming months we will be transitioning our servers to PHP 5.4 as the default. Initially PHP 5.3 will remain as a secondary option that will be selectable via your .htaccess file. Eventually, though, PHP 5.3 will be removed entirely.

It is very important that you keep your scripts up-to-date in order to patch any security vulnerabilities that might be addressed within the updates. As long as you've been keeping up with these you will not have any problems with PHP 5.4. If you've neglected to update your scripts over the past year you'll need to make sure these are taken care of otherwise you may find problems with PHP 5.4. As far as custom code is concerned, you should consult your developer to confirm PHP 5.4 compatibility. Overall, though, the changes from PHP 5.3 to 5.4 aren't anywhere near as big as they were from 5.2 to 5.3 and should have far less of an impact, if any, as a result. If you would like to switch to PHP 5.4 early or test your site on it you can simply add the following line to your .htaccess file:

AddHandler application/x-httpd-php54 .php
The PHP developers also have documentation concerning changes, deprecated features, etc. as this concerns migrating from PHP 5.3 to PHP 5.4 which you can find here.

As always, if you have any questions or concerns please feel free to submit a ticket via our client portal and we'll gladly address them. An additional announcement will be made in late September / October concerning the scheduled transitions to PHP 5.4 as the default PHP version on our servers.