Help! Need example of parsing data from flash to php to xml

Hi,
At the moment im doing my final year of college in multimedia programming and i have come across a problem with my thesis. You see im trying to create a flash that takes in dynamic data and display it on a bar chart. At the moment i have it taking static data from an xml but i have to change the values in xml for the flash chart to appear different.

Is there anyone that can give me an example of how i could press a button which parses data to a php then inturn parses data to that XML file i was talking about early which inturn would change the bar chart informaton dynamically.

Sadly like anything there is one tiny catch. I started this project in AS2 and its too late for me to change back :confused: ( i know im bad please dont kill me lol)

If anyone can help me or give me an example of what im trying to acheive that would be great and i would be soooooo greatful.

Anyway hope you can help and take care.

Peter