<?php

$tempFile = $_FILES['Filedata']['tmp_name'];
$fileName = $_FILES['Filedata']['name'];
$fileSize = $_FILES['Filedata']['size'];

move_uploaded_file($tempFile, "./" . $fileName);

?>

http://www.adobe.com/cfusion/communityengine/index.cfm?event=showdetails&postId=5241&productId=2

got this as part of an example on the adobe cookbook site

PHP used with MXML Upload File Script

php, file, Flex

PHP