[flexcoders] Problem uploading BitmapData as PNG on PHP server.

[robrandid]

Here's my code...

When this runs, test.png is created, but it has a small file size and is 
corrupt.

Any help would be appreciated.

                public function saveImageToServer(event:Event):void
                {
                        var bmp:BitmapData = getBitmapData();
                        var pngEncode:PNGEncoder = new PNGEncoder();
                        var saveRequest:URLRequest = new URLRequest();
                        var loader:URLLoader = new URLLoader();
                        var byteArray:ByteArray = new ByteArray();
                        var variables:URLVariables = new URLVariables();
                        
                        loader.dataFormat = URLLoaderDataFormat.VARIABLES;
                        saveRequest.url = sm.uploadImageHelperFileAddress;
                        byteArray = pngEncode.encode(bmp);
                        saveRequest.method = URLRequestMethod.POST;
                        
                        variables.byteArray = byteArray;
                        variables.directory = um.userName;
                        variables.savePath = sm.savedImageDirectoryAddress;
                        saveRequest.data = variables;
                        
                        loader.addEventListener(Event.COMPLETE, 
handleSaveSuccess);
                        loader.addEventListener(IOErrorEvent.IO_ERROR, 
handleSaveError);
                        loader.load(saveRequest);
                }

<?php
        $png = $_POST['byteArray'];

        file_put_contents($filename, $png);
        echo "success";

?>