<form method="post" enctype="multipart/form-data">
    <input type="file" name="uploaded_image" />
</form>

$uploader = new ImageUploader($_FILES);
$base_64_encoded = $uploader->getBase64EncodedImageData('uploaded_image');
$width = $uploader->getWidth('uploaded_image');
$height = $uploader->getHeight('uploaded_image');

print '<img src="' . $base_64_encoded . '" width=" . $width . " height=" . $height . " />'