PNGEncoder with PHP

I am trying to utilize the PNGEncoder with the dynamicfash Base64 to send a Base64 String to PHP and save the PNG File but for some reason that i cannot figure out, the PNG file is never readable. It is there and has a size (contains data) but cannot be opened by anything so is not a valid png file. Here is my code...

Code:

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        var target:MovieClip = new MovieClip();
        target.graphics.beginFill(0xff0000,5.0);
        target.graphics.drawRect(0,0,100,100);
        target.graphics.endFill();
       
        var bdata:BitmapData = new BitmapData(100, 100);           
        bdata.draw(target); 
        var stream:ByteArray = PNGEncoder.encode(bdata);           
        var byteArrayAsString:String = Base64.encodeByteArray(stream);

        var request:URLRequest = new URLRequest("pngsave.php");
        request.method = URLRequestMethod.POST;
        var variables:URLVariables = new URLVariables();
          variables.fileName = "testing.png";
          variables.image = byteArrayAsString;
          request.data = variables;
        navigateToURL(request, "_blank");

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and the Php...

Code:

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<?php

header('Content-Type: image/png');
header("Content-Disposition: attachment; filename=".$_POST['fileName']);
 
echo base64_decode($_POST["image"]);
?>

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Any ideas on what I am doing wrong here?

I am not sure what exactly is wrong, however here is a class, SaveByteArray, and an example, with which you can save an image on the server.

http://flashscript.biz/flashas3/biz/index.html