Question 198448 in PHP Question posted in
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in PHP how to check if specific session id exists?

How can i check if session id 066efd5a182729d6fdbd43cb3a80adde exists or not? (I know it existed at some point in the past, but I need to know if it still does or not)

session_exists("066efd5a182729d6fdbd43cb3a80adde")
? "this session exists" : "this session expired/got deleted/whatever";

PS This is not a duplicate of:

  • Check if session exists in php because that guy wanted to see if the current request contained a valid cookie session or not (his problem can be solved with session_status() == PHP_SESSION_NONE, mine cannot)
  • PHP if SESSION exists but is null – i don’t even understand what he means by How I can check in PHP if SESSION exists but is null. , i certainly don’t want to check if $_SESSION is null.
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2

Answers


  1. Chosen as BEST ANSWER
    0

    as long as you're using the php-redis session module, or the default php-built-in files session module:

    function session_exists(string $session_id, ?array $stuff = null): bool
{
    if ($stuff === null) {
        $stuff = [];
    }
    $session_module_name = session_module_name();
    if ($session_module_name === 'files') {
        $session_file = session_save_path() . DIRECTORY_SEPARATOR . 'sess_' . $session_id;
        clearstatcache(false, $session_file);
        return file_exists($session_file);
    }
    if ($session_module_name === 'redis') {
        $redis = $stuff['redis_connection'] ?? null;
        if ($redis === null) {
            $redis = new Redis();
            $host = session_save_path(); // tcp://redis:6379
            $port_needle = strrpos($host, ':');
            $port = substr($host, $port_needle + 1);
            $port = filter_var($port, FILTER_VALIDATE_INT);
            if ($port === false) {
                throw new Exception("Unable to parse port from session_save_path(): " . session_save_path());
            }
            $host = substr($host, 0, $port_needle);
            $redis->connect($host, $port);
        }
        return $redis->exists("PHPREDIS_SESSION:{$session_id}") > 0;
    }
    throw new Exception("Unknown/unsupported session module name: {$session_module_name}");
}

    usage:

    echo session_exists("066efd5a182729d6fdbd43cb3a80adde")
 ? "this session exists" : "this session has expired";

  2. 0

    How can i check if session id 066efd5a182729d6fdbd43cb3a80adde exists or not? (I know it existed at some point in the past, but I need to know if it still does or not)

    As with any other session ID as well.

    Ensure you have no session opened, then set the session_id($id) and start the session session_start(). It returns false if there is no such session or if there is automatic fallback to a new session (depends on configuration), then you find $_SESSION[] populated if there is some data associated with that (new) session id.

    Then decide what you want to do with the previously (non-) existing session, like kill it with fire, unset the cookie etc. (depends on context.)

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