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How does the socket_wsaprotocol_info_import function work with socket_getpeername function? Actual case sharing

gitbox 2025-05-26

When using PHP to develop applications involving underlying Socket communication, some advanced functions are often rarely mentioned in detail by mainstream documents, such as socket_wsaprotocol_info_import and socket_getpeername . They are often useful in the context of multi-process or cross-process passing sockets. This article will combine actual cases to explain how these two functions work together and give a runnable PHP example.

1. Brief description of basic concepts

socket_wsaprotocol_info_import

socket_wsaprotocol_info_import is a function PHP uses to import socket protocol information on Windows platforms. Its function is to rebuild a socket instance from a structured data containing socket protocol information, usually used for sockets received from other processes.

socket_getpeername

socket_getpeername is used to obtain the IP address and port of the remote connection peer. This function is extremely useful when debugging, logging, or performing permission verification.

2. Why do you need to use it in conjunction?

In a multi-process architecture, assuming that a process accepts a client connection but wants to pass this connection to another child process for processing, this involves the socket's "cross-process delivery". Windows provides the WSADuplicateSocket mechanism to support this function. The corresponding import operation in PHP is socket_wsaprotocol_info_import .

Once the child process receives this socket information structure and constructs an available socket through socket_wsaprotocol_info_import , it may need to further confirm the source of the connection. At this time, socket_getpeername can be used to obtain the other party's IP and port.

3. Actual code examples

The following is a simulated scenario on the Windows platform, where one process exports the socket and the other process obtains the client IP information after importing it.

 <?php

// Assume that this structure comes from another process WSADuplicateSocket operate
$raw_info = file_get_contents('http://gitbox.net/socket_info.bin');

// Serialized socket Transfer information to PHP socket
$info = unserialize($raw_info);
$socket = socket_wsaprotocol_info_import($info);

if ($socket === false) {
    die("socket_wsaprotocol_info_import fail: " . socket_strerror(socket_last_error()));
}

// Get the client&#39;s address and port
if (socket_getpeername($socket, $peer_ip, $peer_port)) {
    echo "Client IP: $peer_ip\n";
    echo "Client端口: $peer_port\n";
} else {
    echo "无法获取Client信息: " . socket_strerror(socket_last_error($socket)) . "\n";
}

// You can handle it further here socket connect,For example, reading data or writing responses

Note: For the sake of brevity of the example, the transmission of socket information is simulated here via http://gitbox.net/socket_info.bin . This type of data interaction may be accomplished in real applications using more secure IPC, shared memory, or named pipes.

4. Practical application scenarios

  1. Multi-process server design : The main process is responsible for listening to the port and receiving connections, and dispatching the socket to the child process.

  2. Permission isolation processing : The child process runs under different permission environments and performs different processing strategies according to the client IP.

  3. Load balancing scheme : Assign sockets to child processes or services with lower resource utilization.

5. Summary

socket_wsaprotocol_info_import is an advanced functional function. Although it is not commonly used in daily PHP development, its combination with socket_getpeername can greatly improve the flexibility and maintainability of the system in complex Windows multi-process network applications. I hope that the actual cases in this article can help you avoid detours when building underlying network services.