Add logo on image script.
<?php
$logo_file = "logo.png";
$image_file = "img.jpg";
$targetfile = "img2.jpg";
$photo = imagecreatefromjpeg($image_file);
$fotoW = imagesx($photo);
$fotoH = imagesy($photo);
$logoImage = imagecreatefrompng($logo_file);
$logoW = imagesx($logoImage);
$logoH = imagesy($logoImage);
$photoFrame = imagecreatetruecolor($fotoW,$fotoH);
$dest_x = $fotoW - $logoW;
$dest_y = $fotoH - $logoH;
imagecopyresampled($photoFrame, $photo, 0, 0, 0, 0, $fotoW, $fotoH, $fotoW, $fotoH);
imagecopy($photoFrame, $logoImage, $dest_x, $dest_y, 0, 0, $logoW, $logoH);
imagejpeg($photoFrame, $targetfile);
echo '<img src="'.$targetfile.'" />';
?>