php fractal image generator like stackoverflow's default avatar

Question

Is there any php fractal image generating library like stackoverflow's default avatar ? I want to use it for default avatar like this site.

Answer 1

Stack Overflow avatars are provided by Gravatar . The default image is not a fractal -- it is generated using a variant of the Identicon algorithm, which basically just puts together an image using a couple of simple geometric components in a grid.

There is a PHP implementation of the Identicon algorithm available: http://sourceforge.net/projects/identicons/