<?php
$imagesource = 'QuocHan.jpg'; // địa chỉ ảnh cần chèn
if (!file_exists($imagesource)) die ();
$filetype = strtolower(substr($imagesource,strlen($imagesource)-4,4));
if($filetype == ".gif") $image = @ imagecreatefromgif($imagesource);
if($filetype == ".jpg") $image = @ imagecreatefromjpeg($imagesource);
if($filetype == ".png") $image = @imagecreatefrompng($imagesource);
if (empty($image)) die();
$watermark = @imagecreatefrompng('logo.png'); // đây là logo
$imagewidth = imagesx($image);
$imageheight = imagesy($image);
$watermarkwidth = imagesx($watermark);
$watermarkheight = imagesy($watermark);
$startwidth = (($imagewidth - $watermarkwidth)/25);
$startheight = (($imageheight - $atermarkheight)/20);
imagecopy($image, $watermark, $startwidth, $startheight, 0, 0, $watermarkwidth, $watermarkheight);
header("Content-type: image/jpeg");
imagejpeg($image);
imagedestroy($image);
imagedestroy($watermark);
?>