title: How to create a fisheye effect with PHP GD
body: <p>Is there a way to do a FishEye (or Barrel transformation) effect on a image with PHP-GD?
  I found this with some code, but I have a hard time porting it to PHP.</p>
  
  <p><a href="https://stackoverflow.com/questions/2589851/how-can-i-implement-this-visual-effect-in-matlab">How can I implement a fisheye lens effect (barrel transformation) in MATLAB?</a></p>