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$imagefile = $imagen2[0];

/**
 * Opens new image
 *
 * @param $filename
 */
function icreate($filename)
{
  $isize = getimagesize($filename);
  if ($isize['mime']=='image/jpeg')
    return imagecreatefromjpeg($filename);
  elseif ($isize['mime']=='image/png')
    return imagecreatefrompng($filename);
  /* Add as many formats as you can */
}

/**
 * Simple image resample into new image
 *
 * @param $image Image resource
 * @param $width
 * @param $height
 */
function simpleresize($image, $width, $height)
{
  $new = imageCreateTrueColor($width, $height);
  imagecopyresampled($new, $image, 0, 0, 0, 0, $width, $height, imagesx($image), imagesy($image));
  return $new;
}

$imgh = icreate($imagefile);
$imgr = simpleresize($imgh, 512, 512);

header('Content-type: image/png');
imagepng($imgr);?>