We can now offer PHP 5.4. That means that you have the opportunity to use both PHP 5.2, 5.3, and 5.4. You can choose different PHP-versions for each domain. To switch to PHP 5.4, you merely choose this in the control centre under Domains > More Settings.
This is already available for new accounts. Additionally, we will continually expand it so every user will be able to choose PHP 5.4.
PHP 5.4 offers some new functions and, at the same time, removes some old ones. As this can have an influence on your scripts, we recommend that you read PHP’s changelog.