We can now offer PHP 5.4. That means you can use PHP 5.2, 5.3, and 5.4. You can choose different PHP versions for each domain. To switch to PHP 5.4, choose it in the Control Center under Domains > More Settings.
This is already available for new accounts. We will continue rolling it out 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 affect your scripts, we recommend that you read PHP’s changelog.