There are a number of PHP versions avaliable at any one time. You can swap between then easily with the hosting control panel and this article shows you how to do this.
1. Login to our portal and go to your hsoting plan
2. Under 'Web & Applications' click on 'Web Sites' and then click on the website you want to change the PHP version for.
4. Make sure you click either 'Save Changes and Exit' or 'Save Changes'.