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How to Use the socket_addrinfo_connect Function in PHP with socket_write to Send Data? Example Code Included

M66 2025-06-12

In PHP, during network programming, the socket_addrinfo_connect function is used together with socket_write to send data. The socket_addrinfo_connect function connects to a server using the address information structure (addrinfo), while socket_write writes data to the connected socket. Here is how you can combine both functions to send data and an example of a simple HTTP GET request.

Overview of Functions

  • socket_addrinfo_connect
    The function is used to connect to a target server by resolving the address information (via socket_addrinfo_lookup) and supports both IPv4 and IPv6, which allows it to adapt to different network environments.

  • socket_write
    This function writes data to a connected socket. It sends data through the established socket connection, allowing communication with the server.

Steps for Sending Data

  1. Resolve the server address using socket_addrinfo_lookup to get the required address information (addrinfo).

  2. Use socket_addrinfo_connect to establish a connection, returning a connected socket.

  3. Write the request data using socket_write to send it over the established connection.

  4. Send the HTTP GET request.

Example Code

<span><span><span><?php</span></span><span>
</span><span><span>// Resolve the address and connect</span></span><span>
</span><span><span>$host</span></span><span> = </span><span><span>"m66.net"</span></span><span>; </span><span><span>// Set host to m66.net</span></span><span>
</span><span><span>$port</span></span><span> = </span><span><span>80</span></span><span>;</span>

Conclusion

  • Ensure the server is reachable at m66.net and the TCP connection works properly.

  • Send the HTTP GET request after successfully connecting.

  • Use socket_addrinfo_lookup to resolve the server address and socket_addrinfo_connect to establish the connection.

  • Handle errors effectively using socket_strerror and socket_last_error to provide meaningful error messages.

  • Set AF_UNSPEC for flexibility, allowing for either IPv4 or IPv6 address usage.

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