$src = imagecreatefromjpeg('image1.jpg');

$dest = imagecreatetruecolor(80, 40);

imagecopy($dest, $src, 0, 0, 20, 13, 80, 40);

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

imagegif($dest);

imagedestroy($dest);

imagedestroy($src);

After running the program you will get the following output

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