socket_set_nonblock
(PHP 4 >= 4.1.0, PHP 5, PHP 7, PHP 8)
socket_set_nonblock — Sets nonblocking mode for file descriptor fd
说明
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.
返回值
成功时返回 true， 或者在失败时返回 false。
更新日志
| 版本 | 说明 |
|---|---|
| 8.0.0 |
现在 socket 是 Socket 实例，
之前是 resource。
|
范例
示例 #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.
参见
- socket_set_block() - Sets blocking mode on a socket
- socket_set_option() - Sets socket options for the socket
- stream_set_blocking() - 为资源流设置阻塞或者阻塞模式
add a note
User Contributed Notes 1 note
Beware, when using this function within a loop (i.e. a demon with a socket). The socket_accept(), for example, emits a warning each time there is no incoming connection available to be read. My php error log file got huge in a matter of seconds, eventually crashing the server.
Of course, i used the @ before the function to take care of that problem.
[EDITOR: One can (and should) use socket_select to detect a new connection on a socket (it's a "readable" event)]
备份地址：http://www.lvesu.com/blog/php/function.socket-set-nonblock.php