Add cache length parameter to the PHP parameter parsing.
send data as a counter, m has no meaning in statsd
Remove the old FIFO socket from the event queue when recreating it
The previous code had two problems: 1) It never removed the old fd from the event loop, which meant that if the new fd received a different index, the old fd would keeping waking up the master process repeatedly. 2) If the new fd got the same index but the master loop went back to epoll_wait() fast enough, Linux would claim that the socket is ready for reading, but read() would return 0 again, which would cause the FIFO to be recreated again, etc. Fix by removing the old fd from the event queue before recreating it.