It's an extension. The github project is here: https://github.com/bukka/php-fann https://github.com/bukka/php-fann The library itself has existed for more th

It's an extension. The github project is here: https://github.com/bukka/php-fann https://github.com/bukka/php-fann The library itself has existed for more than a decade, but the PHP bindings have been in development on Github it appears since Dec. 2012. But I'm almost certain the documentation page has only recently shown up on php.net website.