Context/socket-Phpdoc专题

套接字上下文选项

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 <span class="function">stream_socket_server.

ipv6_v6only
Overrides the OS default regarding mapping IPv4 into IPv6.

Note:

This is important in particular when trying to listen on IPv4 addresses separately while there exists a binding on [::].

This is only applicable to <span class="function">stream_socket_server.

so_reuseport
Allows multiple bindings to a same ip:port pair, even from separate processes.

Note:

This is only applicable to <span class="function">stream_socket_server.

so_broadcast
Enables sending and receiving data to/from broadcast addresses.

Note:

This is only applicable to <span class="function">stream_socket_server.

tcp_nodelay
Setting this option to true will set SOL_TCP,NO_DELAY=1 appropriately, thus disabling the TCP Nagle algorithm.

更新日志

范例

示例 #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 the '2001:db8::1' IPv6 address
// and port '7000'
$opts = array(
    'socket' => array(
        'bindto' => '[2001:db8::1]: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);

?>