watermerk op een afbeelding in img tag

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?php
ini_set('display_errors', 1);
ini_set('display_startup_errors', 1);
error_reporting(E_ALL);


$stamp = imagecreatefrompng('stampimg.png');
$im = imagecreatefromjpeg('flower.jpg');

$marge_right = 10;
$marge_bottom = 10;
$sx = imagesx($stamp);
$sy = imagesy($stamp);

$imgx = imagesx($im);
$imgy = imagesy($im);
$centerX=round($imgx/2);
$centerY=round($imgy/2);


imagecopy($im, $stamp, $centerX, $centerY, 0, 0, imagesx($stamp), imagesy($stamp));



 echo '<img src=" $im " alt=""> ';
 
imagejpeg($im); 
imagedestroy($im);
?>

<img src="<?php echo $im; ?>" alt="">