(PHP 4 >= 4.1.0, PHP 5, PHP 7)
socket_set_nonblock — Sets nonblocking mode for file descriptor fd
socket_set_nonblock ( resource $socket ) : bool
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 operation. Rather, if the operation would result in a block, the called function will fail.
socket
A valid socket resource created with socket_create() or socket_accept().
Returns true on success or false on failure.
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.
© 1997–2020 The PHP Documentation Group
Licensed under the Creative Commons Attribution License v3.0 or later.
https://www.php.net/manual/en/function.socket-set-nonblock.php