React php connecting with a different port

Question

I have two files opening a new socket and want them to connect to each other using React PHP. The following two files are the sockets:

First file test1.php

<?php

include 'vendor/autoload.php';

$socket = new \React\Socket\SocketServer('127.0.0.1:3030');
$socket->on('connection', function(\React\Socket\ConnectionInterface $connection) {
    echo '[' . $connection->getRemoteAddress() . ' connected]' . PHP_EOL;
});

Second file test2.php

<?php

include 'vendor/autoload.php';

$socket = new \React\Socket\SocketServer('127.0.0.1:3031');
$connector = new \React\Socket\Connector();
$connector->connect('127.0.0.1:3030')
    ->then(function(\React\Socket\ConnectionInterface $connection) {
        echo '[Connected with ' . $connection->getRemoteAddress() . ']' . PHP_EOL;
    });

If I run php test1.php and then php test2.php I would expect the following outcome:

[Connected with tcp://127.0.0.1:3030]
[tcp://127.0.0.1:3031 connected]

However, the result is:

[Connected with tcp://127.0.0.1:3030]
[tcp://127.0.0.1:61594 connected]

What am I doing wrong here? How do I get React PHP to connect with the 3031 port?

Answer 1

The tcp://127.0.0.1:61594 is actually the address of the client socket here and 127.0.0.1:3031 the address of the server socket which is addressed by incoming connections.

When connecting to 127.0.0.1:3030 the SocketServer('127.0.0.1:3031') doesn't use it's server socket address as the client socket address, because this address is already in use. Instead your OS generates a random port number for the client socket (in this case 61594).

I hope this helps.

Answer 2

If our test2.php should act as a client, the SocketServer is not needed.

In order to bind a port to your client connection, do:

<?php

include 'vendor/autoload.php';

$connector = new \React\Socket\Connector(
    ['tcp' => ['bindto' => '127.0.0.1:12345']] // ip:port here
);


$connector->connect('127.0.0.1:3030')
    ->then(function(\React\Socket\ConnectionInterface $connection) {
        echo '[Connected with ' . $connection->getRemoteAddress() . ']' . PHP_EOL;
    });

This will use port 12345 for your client connection. See also https://www.php.net/manual/context.socket.php.