套接字上下文选项列表

说明

套接字上下文选项可用于所有工作在套接字上的封装协议，像 tcp, http 和 ftp.

可选项

bindto: 用户PHP访问网络的指定的IP地址（IPv4或IPv6其中的一个）和/或端口号，这个语法是 ip:port. Setting the IP or the port to 0 will let the system choose the IP and/or port.

Note:
As FTP creates two socket connections during normal operation, the port number cannot be specified using this option.
backlog: Used to limit the number of outstanding connections in the socket's listen queue.

Note:
This is only applicable to stream_socket_server().

更新日志

版本	说明
5.1.0	Added bindto.
5.3.3	Added backlog.

范例

Example #1 Basic bindto usage example


<?php
// connect to the internet using the '192.168.0.100' IP
$opts = array(
    'socket' => array(
        'bindto' => '192.168.0.100:0',
    ),
);


// connect to the internet using the '192.168.0.100' IP and port '7000'
$opts = array(
    'socket' => array(
        'bindto' => '192.168.0.100:7000',
    ),
);


// connect to the internet using port '7000'
$opts = array(
    'socket' => array(
        'bindto' => '0:7000',
    ),
);


// create the context...
$context = stream_context_create($opts);

// ...and use it to fetch the data
echo file_get_contents('http://www.example.com', false, $context);

?>