(PHP 4 >= 4.1.0, PHP 5, PHP 7)
Sets nonblocking mode for file descriptor fd
bool socket_set_nonblock ( resource $socket )
The socket_set_nonblock() function sets the O_NONBLOCK flag on the socket specified by the socket parameter.
When an operation (e.g. receive, send, connect, accept, ...) is performed on a non-blocking socket, the script will not pause its execution until it receives a signal or it can perform the op