note 18478 deleted from function.socket-set-nonblock by nlopess

Note Submitter: alan at akbkhome dot com ---- if you are using non blocking sockets, you need to be aware that socket_accept will return 0, so you need to check what it returns is_resource() to see if it connected. when using socket_read, you need to call socket_last_error($sock). If the return value is 11 (I assume EAGAIN), then It means that there is no data in the queue, but the socket is still alive.