PHP vulnerability: Which websites and services are affected?

If some of your usual websites aren’t working today, their operators may have temporarily shut them down to keep hackers out.Two serious security flaws have been discovered in PHP, a programming language that helps websites run. On vulnerable servers, those flaws could allow hackers to run their own commands or access sensitive information. Because PHP is used across so many different websites, the same security problem has left operators around the world scrambling to protect their systems.A