PHP Add Logo/CopyRight to Image (Watermark)

<?php
     echo "<img src=MyResize/image.png>";
     $filname = "winner.gif";
     $src = ImageCreateFromGif($filname);
     $size = GetImageSize($filname);
     $im = ImageCreate(500, 450);
   
     $bg = ImageColorAllocate($im, 255, 255, 0);
     $color = ImageColorAllocate($im, 0, 0, 0);
   
     ImageCopy($im, $src, 100, 50, 0, 0, $size[0], $size[1]);
 
     ImagePng($im,"MyResize/image.png");
     ImageDestroy($src);
     ImageDestroy($im);
?>

<?php
	echo "<img src=MyResize/image.png>";
	$myImage = imagecreatefromjpeg('mygirl.jpg');
	$myCopyright = imagecreatefromjpeg('thaicreate.jpg');


	$destWidth = imagesx($myImage);
	$destHeight = imagesy($myImage);
	$srcWidth = imagesx($myCopyright);
	$srcHeight = imagesy($myCopyright);

	$destX = ($destWidth - $srcWidth) / 2;
	$destY = ($destHeight - $srcHeight) / 1;
	$white = imagecolorexact($myCopyright, 255, 255, 255);
	imagecolortransparent($myCopyright, $white);

	imagecopymerge($myImage, $myCopyright, $destX, $destY, 0, 0, $srcWidth, $srcHeight, 50);


	imagejpeg($myImage,"MyResize/image.png");
	imagedestroy($myImage);
	imagedestroy($myCopyright);
?>