[PHP] ImageCopyResized works on JPG but not PNG?

[Jough P]

Greetings all, I have a real simple function.  I works well on JPG 
images but ImageCopyResized(), or ImagePNG() doesn't seem to be 
working.  When I view the uploaded file it is still it's original size. 
 Here is the function.  I hope someone can help me, I'm pretty stumped.

   function transform_to_profile_pic()
   {
      $path = $this->origpath;
      $type = $this->type;
      # make jpg or png image
      $img_dst = imagecreatetruecolor(PROFILE_IMAGE_W,PROFILE_IMAGE_H);
      if($type == 2)
         $img_src = imagecreatefromjpeg($path);
      else if($type == 3)
         $img_src = imagecreatefrompng($path);
      # Overwrite the original with the resized image to the filesystem
      imagecopyresized($img_dst, $img_src, 0, 0, 0, 0, PROFILE_IMAGE_W, 
PROFILE_IMAGE_H, imagesx($img_src), imagesy($img_src)
      if($type == 2)
         imagejpeg($img_dst, $path, 100);
      else if($type == 3)
         imagepng($img_dst, $path . ".png", 100);
   }

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