An implementation of most of the Arduino Wiring functions for the Raspberry Pi
You will need to clone this repository with the --recursive flag on git clone as it contains WiringPi as a submodule.
You will need to first install php-dev or php5-dev
Then
./build.sh
This will give you a build folder with the wiringpi.so module, this needs to go in the relevant folder of your PHP installation.
Most likely somewhere in /usr/lib/php5/
Alternatively you can:
sudo ./install.sh
To choose the pin mapping type that you wish to use, create an ini file /etc/php5/conf.d/wiringpi.ini and adding the following:
extension=wiringpi.so
wiringpi.pinmaptype=[PINS|GPIO|USER]