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PHP: Add watermark on a picture

Add a watermark on a picture in PHP:

<?php
// Load the stamp and the photo to apply the watermark to
$stamp = imagecreatefrompng('stamp.png');
$im = imagecreatefromjpeg('photo.jpeg');

// Set the margins for the stamp and get the height/width of the stamp image
$marge_right = 10;
$marge_bottom = 10;
$sx = imagesx($stamp);
$sy = imagesy($stamp);

// Copy the stamp image onto our photo using the margin offsets and the photo 
// width to calculate positioning of the stamp. 
      imagecopy($im, 
                $stamp, 
                imagesx($im) - $sx - $marge_right, 
                imagesy($im) - $sy - $marge_bottom, 
                0, 
                0, 
                imagesx($stamp), 
                imagesy($stamp));

// Output and free memory
header('Content-type: image/png');
imagepng($im);
imagedestroy($im);
?>

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