Identifying their score

For my game, I have the whole send score thing. I have the flash part include the php with the scripting on it for the send score, but I don’t understand how to get it to identify what they score was(_root.score)…if I just enter any old score into the scripting it works, so I know its not how I scripted it. (I tried using $score, which is what my friend told me to do). Please help me!