Merge images using php

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Iam explain about how to merge images using php
The following lines of code is used to merge images.

<?php
header('Content-Type: image/jpeg');

$backgroundimage = imagecreatefromjpeg('tshirt.jpg');
$overlayimage= imagecreatefrompng('Buy-Now.png');

imagecopy($backgroundimage, $overlayimage, 100, 200, 0, 0, 130, 40);
imagejpeg($backgroundimage, null, 100); 

?>

Before merge Images:

After merge the Images: