Troubleshooting errors having updated PHP

Upgrade Help & FAQs > How to change the PHP version my webserver uses

Remember, don't panic!

If you've just updated the PHP version running your website and you get either errors on screen or maybe just a blank white screen the first thing to do is not panic. It's highly likely that reverting to the previously used version of PHP will fix things.

Having reverted to a working version of PHP you now have a few options:

1. If you have some experience of programming in PHP, undertake a troubleshooting process to debug the problems with your website yourself. If you do get just a white screen it's highly likely that errors are just disabled in your PHP configuration.
   
   It may be that you can either enable on-screen errors (by a change of your PHP configuration) or review them via a log file that is being generated on your web server.
   
   Troubleshooting exactly what is wrong is too big a task for us on this site. However if you have detailed information to hand as to the errors occurring when running your site on a current version of PHP a good place to ask a question is Stack Overflow.
2. Get someone else to do this for you - it may well now be a good moment to get some professional help by contacting a developer.