appending data to external text file by PHP and Actionscript3

[turbovps]

\[code\]import fl.controls.*;var MyText:TextArea = info_txt;var score:XML = new XML(<score/>);score.PlayerName = "Maged";trace(score);\[/code\]Here I create a new XML date , I want to write these data to an external text file to use it by PHP but I don't have much information about it .Note i want to append to the text field n't write .