I’ve got an extremely early library for using PHP to access the BeagleBoneBlack under ubuntu v13.04
https://github.com/garyamort/php-bbbone
This repository combines code from the bonescript library: https://github.com/jadonk/bonescript and the PHP GPIO library for the Raspberry Pi: https://github.com/ronanguilloux/php-gpio
Right now I only have ledOn and ledOff methods configured in the BBB class - the rest of the files all come from the Raspberry Pi or the Bonescript code. As I get functions enabled modelled off the bonescript API, I can go ahead and slowly delete out the other code. I just find it easier to keep all the code in one place while editing.