Check http://www.servergrove.com/zendframework to see the current PHP version installed on ServerGrove servers.
Other PHP information is:
1. Zend Optimizer
2. support enabled for curl, GD 2, imap, interbase, mbstring, mcrypt, mysql, odbc, openssl, PDO (sqlite, mysql), pspell and others.
3. ionCube module.
Contact us for custom needs.
We make sure to keep PHP updated with the latest production releases.