title: Detecting animated GIF on the fly using PHP/CodeIgniter
body: <p>Is there any way to check if an image <a href="http://en.wikipedia.org/wiki/Uniform_Resource_Locator" rel="nofollow">URL</a> returns an animated or not GIF?</p>
  
  <p>I need to save image URLs and then show the images on my site, so I would like to allow GIF extension, but I need to avoid animated GIFs. Is it possible to detect that on the fly with out downloading the image?</p>