How i can made a certificate in php with clients profile photo and signature?

Question

I am trying to do this but i faced a problem that how can i add multiple image?

<?php
header('content-type:image/jpeg');
$font="times.ttf";
$image=imagecreatefromjpeg("aadhar.jpg");
$color=imagecolorallocate($image,19,21,22);
$name="demo";
imagettftext($image,24,0,1810,320,$color,$font,$name);
$date="6th may 2020";
imagettftext($image,50,0,450,595,$color,$font,$date);
imagejpeg($image);
imagedestroy($image);
?>