Wasted 3 hrs on this today:
-Wanted to control pi gpio pins from php web server
-shell_exec(gpio write x x) wasnt working for me
-made a python script for gpio toggling which i wanted to execute with shell_exec
-still not working. Changed permissions, changed code , did everything possible SO MANY TIMES!
-Turns out if i had added a '-g' in the gpio write command..it would have worked in the first place!
FUUUUCK!!!!!!!