PHP - Manual: socket_bind

2024-04-28

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socket_bind

(PHP 4 >= 4.1.0, PHP 5, PHP 7, PHP 8)

socket_bind — 给套接字绑定名字

说明

socket_bind(Socket $socket, string $address, int $port = 0): bool

绑定 address 到 socket。该操作必须是在使用 socket_connect() 或者 socket_listen() 建立一个连接之前。

参数

socket

用 socket_create() 创建的 Socket 实例。

address

如果套接字是 AF_INET 族，那么 address 必须是一个四点分法的 IP 地址（例如 127.0.0.1 ）。

如果套接字是 AF_UNIX 族，那么 address 是 Unix 套接字一部分（例如 /tmp/my.sock ）。

port （可选）

参数 port 仅仅用于 AF_INET 套接字连接的时候，并且指定连接中需要监听的端口号。

返回值

成功时返回 true，或者在失败时返回 false。

错误代码会传入 socket_last_error() ，如果将此参数传入 socket_strerror() 则可以得到错误的文字说明。

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 使用 socket_bind() 来设置套接字资源地址


<?php
// Create a new socket
$sock = socket_create(AF_INET, SOCK_STREAM, SOL_TCP);

// An example list of IP addresses owned by the computer
$sourceips['kevin']    = '127.0.0.1';
$sourceips['madcoder'] = '127.0.0.2';

// Bind the source address
socket_bind($sock, $sourceips['madcoder']);

// Connect to destination address
socket_connect($sock, '127.0.0.1', 80);

// Write
$request = 'GET / HTTP/1.1' . "\r\n" .
           'Host: example.com' . "\r\n\r\n";
socket_write($sock, $request);

// Close
socket_close($sock);

?>

注释

注意:
该函数必须在 socket_connect() 之前使用。

注意:
Windows 9x/ME 兼容性注意点: 如果尝试绑定套接字资源到一个错误的地址，而这个地址不是本机的地址，那么 socket_last_error() 可能会返回一个无效的错误代码。

参见

socket_connect() - 开启一个套接字连接
socket_listen() - Listens for a connection on a socket
socket_create() - 创建一个套接字（通讯节点）
socket_last_error() - Returns the last error on the socket
socket_strerror() - Return a string describing a socket error

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User Contributed Notes 7 notes

down

keksov[at]gmx.de ¶

20 years ago


If you want to reuse address and port, and get rid of error: unable to bind, address already in use, you have to use socket_setopt (check actual spelling for this function in you PHP verison) before calling bind:


<?php

if (!socket_set_option($sock, SOL_SOCKET, SO_REUSEADDR, 1)) {

    echo socket_strerror(socket_last_error($sock));

    exit;

}

?>



This solution was found by 

Christophe Dirac. Thank you Christophe!

down

dresende at thinkdigital dot pt ¶

10 years ago


Regarding previous post:

"0" has address is no different from "0.0.0.0"

127.0.0.1 -> accept only from local host
w.x.y.z (valid local IP) -> accep only from this network
0.0.0.0 -> accept from anywhere

down

php50613160534 dot 3 dot korkman at spamgourmet dot org ¶

17 years ago


Use 0 for port to bind a random (free) port for incoming connections:

socket_bind ($socket, $bind_address, 0);
socket_getsockname($socket, $socket_address, $socket_port);
socket_listen($socket);
...

$socket_port contains the assigned port, you might want to send it to a remote client connecting. Tested with php 5.03.

down

gasket at cekkent dot net ¶

19 years ago


The aforementioned tidbit about using NULL to bind to all addresses did not work for me, as I would receive an error about unknown address. Using a 0 worked for me:

socket_bind ($socket, 0, $port)

This also allows you to receive UDP broadcasts, which is what I had been trying to figure out.

down

-1

ealexs at gmail dot com ¶

3 months ago


I am posting this as I've spent a few hours debugging this.

If you use socket_create / socket_bind with Unix domain sockets, then using socket_close at the end is not sufficient. You will get "address already in use" the second time you run your script. Call unlink on the file that is used for Unix domain sockets, preferably before you start to create the socket.

<?php

$socket_file = "./test.sock";

if (file_exists($socket_file))
        unlink($socket_file);
# optional file lock
$socket = socket_create(AF_UNIX, SOCK_STREAM, 0);
# ... socket_set_option ...
socket_bind($socket, $socket_file);
# ...
socket_close($socket);
# optional : release lock
unlink($socket_file);

?>

down

-2

gabriel at plenitech dot fr ¶

8 years ago


When doing Unix sockets, it might be necessary to chmod the socket file so as to give Write permission to Group and/or Others. Otherwise, only the owner is allowed to write data into the stream.

Example:

<?php
$sockpath = '/tmp/my.sock';
socket_bind($socket, $sockpath);
//here: write-only (socket_send) to others, only owner can fetch data.
chmod($sockpath, 0702);
?>

down

-11

Mex ¶

10 years ago


It appears for the $address parameter:

'127.0.0.1'
accepts clients from localhost (eg. 127.0.0.1)

'0.0.0.0'
accepts clients from localhost, and the server's network (eg. 127.0.0.1, 192.168.2.5, 10.20.30.40)

'0' or 0
accepts clients from localhost, the server's network, and external networks (eg. 127.0.0.1, 192.168.2.5, 10.20.30.40, 209.85.169.99)

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官方地址：https://www.php.net/manual/en/function.socket-bind.php

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PHP官方手册 - 互联网笔记

socket_bind

说明

参数

返回值

更新日志

范例

注释

参见

User Contributed Notes 7 notes