How to pass $_SESSION variables to a websocket server?

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深忆病人

I have searched a lot on the web but didn\'t find a useful clue.

I have a websocket server and a web server running together on my local machine.

I need to

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栀梦

2021-01-18 04:20

As other StackOverflow answers show (Ratchet without Symfony session, Starting a session within a ratchet websocket connection), there is no way to directly share the $_SESSION variable between Apache and the Ratchet process. It is possible, however, to start a session with the Apache server and then access the session cookie within the Ratchet code.

Apache server's index.html starts the session:

<?php
// Get the session ID.
$ses_id = session_id();
if (empty($ses_id)) {
    session_start();
    $ses_id = session_id();
}
?><!DOCTYPE html> ...

Ratchet MessageComponentInterface code accesses the session token:

public function onMessage(ConnectionInterface $from, $msg) {
    $sessionId = $from->WebSocket->request->getCookies()['PHPSESSID'];
    # Do stuff with the token...
}

Once both servers know the user's session token, they can use the token to share information through a MySQL database (which is what I do):

    # Access session data from a database:
    $stmt = $this->mysqli->prepare("SELECT * FROM users WHERE cookie=?");
    $stmt->bind_param('s', $sessionId);
    $stmt->execute();
    $result = $stmt->get_result();

Alternatively, you could do a more exotic form of inter-process communication:

    # Ratchet server:
    $opts = array(
        'http'=>array(
            'method'=>'GET',
            'header'=>"Cookie: PHPSESSID=$sessionId\r\n"
        )
    );
    $context = stream_context_create($opts);
    $json = file_get_contents('http://localhost:80/get_session_info.php', false, $context);
    $session_data = json_decode($json);

    # Apache server's get_session_info.php
    # Note: restrict access to this path so that remote users can't dump
    # their own session data.
    echo json_encode($_SESSION);

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