The post says that Easter egg only works if 'expose_php' is set in php.ini, which will also report the PHP version in the X-Powered-By header of every response.

The post says that Easter egg only works if 'expose_php' is set in php.ini, which will also report the PHP version in the X-Powered-By header of every response. So it doesn't seem to leak any information that wouldn't already be available.