Php reading xml in post request

[justinrko]

So, I have perform two stepsa) Create a some random xml file in one of the php file. b) Parse the same xml file in second file.Key points are that php file in a) will issue a post request to php file b) with only xml as its request. file b) will have to read the xml file using SImpleXml. I am trying to do something for this http://blog.superfeedr.com/API/pubsubhubbub/getting-started-with-pubsubhubbub/. I my server will be receiving notifications in form of xml from the the superfeeder. The notifications will be xml file in the request. I am doing step a) just to confirm that my part b) is correct. How to do this in PHP.I tried all the $_REQUEST, $GLOBALS variable. But, not sure whats the way!