(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.
A valid socket resource created with socket_create() or socket_accept().
成功时返回 TRUE， 或者在失败时返回 FALSE.
Example #1 socket_set_block() example
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.
<?php
$socket = socket_create_listen(1223);
socket_set_block($socket);
socket_accept($socket);
?>