<mx:HTTPService id="screencap" url="http://demo.ribbit.mobi/heartbeat/storeImage.php" method="POST" resultFormat="e4x" result="screencapSuccess(event);" fault="screencapError(event);">  
                                <mx:request>
                                <screencapImg>{encodedData}</screencapImg>
                </mx:request>
    </mx:HTTPService>
 
 
public function takeSnapshot(target:UIComponent) :void
{
                                                                var bd:BitmapData = new BitmapData(target.width,target.height);
                                                                bd.draw(target);
                                                                //var ba:ByteArray = PNGenc.encode(bd);
                                                                var jpgEncoder:JPGEncoder = new JPGEncoder(100);
                                                                var ba:ByteArray = jpgEncoder.encode(bd);
                                                                var be:Base64Encoder = new Base64Encoder();
                                                                be.encodeBytes(ba);
                                                                encodedData = be.flush();
                                                                //ro.saveImage(encodedData);
                                                                screencap.send();
}
 
<?php
$encodedPNGData = $_POST['screencapImg'];
$binaryData = base64_decode($encodedPNGData);
$file = "/tmp/heartbeat_current.jpg";
file_put_contents($file, $binaryData);
?>

Save a bitmap to anything in AS3

php

ActionScript 3