In php's fsockopen() findout user's port number

How to find out the port number on the user's machine from which the 开发者_如何学JAVAconnection is made?

fsockopen returns a stream resource. I've searched through the PHP documentation and can't find a way to get the client port from the stream resource.

However, if you go one level lower and use sockets you can easily get at this info. http://www.php.net/manual/en/book.sockets.php

$socket = socket_create(AF_INET, SOCK_STREAM, SOL_TCP);
socket_connect($socket, 'stackoverflow.com', 80);
socket_getsockname($socket, $host, $port);
var_dump($port);
socket_close($socket);

Try running the netstat command.

netstat -an

It's available as part of the $_SERVER super global

$port = $_SERVER['REMOTE_PORT'];