Yüklenen Resimlere Otomatik Yazı Ekleme

<?php
header("Content-type: image/JPG");
$rsm = imagecreatetruecolor(100, 100);

$white = imagecolorallocate($rsm, 255, 255, 255);
$grey = imagecolorallocate($rsm, 128, 128, 128);
$black = imagecolorallocate($rsm, 0, 0, 0);
imagefilledrectangle($rsm, 0, 0, 399, 29, $white);

$text = 'Örnek text buraya gelecek.';
$font = 'arial.ttf';

imagettftext($rsm, 20, 0, 11, 21, $grey, $font, $text);
imagettftext($rsm, 20, 0, 10, 20, $black, $font, $text);
imagepng($rsm);
imagedestroy($rsm);
?>