(PHP 4 >= 4.2.0, PHP 5)
socket_set_block — Sets blocking mode on a socket resource
The socket_set_block() function removes 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 blocking socket, the script will pause its execution until it receives a signal or it can perform the operation.
如果成功则返回 TRUE，失败则返回 FALSE。
Example#1 socket_set_block() example
<?php
$socket = socket_create_listen(1223);
socket_set_block($socket);
socket_accept($socket);
?>
This example creates a listening socket on all interfaces on port 1223 and sets the socket to O_BLOCK mode. socket_accept() will hang until there is a connection to accept.