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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 域套接字的路径（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。

    使用 socket_last_error() 检索错误代码，如果将此代码传入 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。

    示例

    示例 #1 使用 socket_bind() 来设置源地址

    <?php
    // 创建新的套接字
    $sock = socket_create(AF_INET, SOCK_STREAM, SOL_TCP);

    // 计算机拥有的 IP 地址示例列表
    $sourceips['kevin'] = '127.0.0.1';
    $sourceips['madcoder'] = '127.0.0.2';

    // 绑定源地址
    socket_bind($sock, $sourceips['madcoder']);

    // 连接到目标地址
    socket_connect($sock, '127.0.0.1', 80);

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

    // 关闭
    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

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    User Contributed Notes 7 notes

    up
    15
    keksov[at]gmx.de
    22 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
    8
    dresende at thinkdigital dot pt
    13 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
    5
    php50613160534 dot 3 dot korkman at spamgourmet dot org
    19 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
    1
    gasket at cekkent dot net
    21 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
    -1
    ealexs at gmail dot com
    2 years 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);

    ?>
    up
    -2
    gabriel at plenitech dot fr
    11 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
    -11
    Mex
    13 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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