(PHP 4 >= 4.0.7, PHP 5)
socket_set_nonblock — Sets nonblocking mode for file descriptor fd
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 not pause its execution until it receives a signal or it can perform the operation. Rather, if the operation would result in a block, the called function will fail.
如果成功则返回 TRUE，失败则返回 FALSE。
Example#1 socket_set_nonblock() example
<?php
$socket = socket_create_listen(1223);
socket_set_nonblock($socket);
socket_accept($socket);
?>
This example creates a listening socket on all interfaces on port 1223 and sets the socket to O_NONBLOCK mode. socket_accept() will immediately fail unless there is a pending connection exactly at this moment.