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socket_bind

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

socket_bind给套接字绑定名字

说明

bool socket_bind ( resource $socket , string $address [, int $port = 0 ] )

绑定 addresssocket。 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

socket_create() 创建的一个有效的套接字资源。

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。

范例

Example #1 使用 socket_bind() 来设置套接字资源地址

<?php
// Create a new socket
$sock socket_create(AF_INETSOCK_STREAMSOL_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

Note:

该函数必须在 socket_connect() 之前使用。

Note:

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

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User Contributed Notes 6 notes

up
9
keksov[at]gmx.de
16 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!
up
1
dresende at thinkdigital dot pt
6 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
up
0
gabriel at plenitech dot fr
5 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);
?>
up
0
php50613160534 dot 3 dot korkman at spamgourmet dot org
13 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.
up
0
gasket at cekkent dot net
15 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.
up
-11
Mex
6 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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