Php ::use A PHP Tool To Provide A Series Of Checkboxes/dropdown Inside?

Okay so this task needs to work like this:

1) Flash environment starts (as3 code base)

2) Flash receives data from xml

3) PHP tool inserts a dropdown menu of choices into flash environment.

4) Player selects from dropdown

5) PHP captures selections and writes to xml

So first of all, I dont want to do this another way, it has to be exactly like that. Now that having been said, i have accomplished the first two steps. Here is the extremely basic xml i am working with:

< LISTING HELMET="1" TORSO="2" PANTS="1"/>

This stores 3 string id codes which flash loads up. Inside of flash i load those three values and use them to index movieclips to their correct frame. This is done.

So now i need to write a PHP tool that creates three dropboxes on the flash stage, each box should list red, blue and yellow. When the player makes a selection in the dropbox the PHP tool needs to alter the three xml entries to record the player choice. Can you do this with PHP? Or do the dropdown boxes HAVE to be in AS3 and the PHP just be about transferring the data only? As a bonus, as the player makes his choices the PHP tool would update the variables in flash so the images change without rebooting the flash envronment..