كود PHP:
Header("Content-Type: image/png");
$imaged=rand(1,10);
$imagedd=rand(1,100000000);
$im = ImageCreateFromJPEG("ava/" . $imaged . ".jpg");
$white = ImageColorAllocate($im, 0, 0, 0);
srand((double)microtime()*1000000);
$string = md5(rand(0,9999));
$new_string = substr($string, 10, 7);
ImageString($im, 5, 65, 10, $new_string, $white);
$im2= imagecreatetruecolor(imageSX($im),imageSY($im));
imageCopyMerge($im2, $im,0,0,0,0,(imageSX($im)),(imageSY($im)),100);
ImagePNG($im2, "ava/verify" . $imagedd . ".png");
ImageDestroy($im);