function SessionManager::start

File

core/lib/Drupal/Core/Session/SessionManager.php, line 105

Class

SessionManager

Manages user sessions.

Namespace

Code

public function start() {
    if (($this->started || $this->startedLazy) && !$this->closed) {
        return $this->started;
    }
    $request = $this->requestStack
        ->getCurrentRequest();
    $this->setOptions($this->sessionConfiguration
        ->getOptions($request));
    if ($this->sessionConfiguration
        ->hasSession($request)) {
        // If a session cookie exists, initialize the session. Otherwise the
        // session is only started on demand in save(), making
        // anonymous users not use a session cookie unless something is stored in
        // $_SESSION. This allows HTTP proxies to cache anonymous pageviews.
        $result = $this->startNow();
    }
    if (empty($result)) {
        // Randomly generate a session identifier for this request. This is
        // necessary because \Drupal\Core\TempStore\SharedTempStoreFactory::get()
        // wants to know the future session ID of a lazily started session in
        // advance.
        //
        // @todo: With current versions of PHP there is little reason to generate
        //   the session id from within application code. Consider using the
        //   default php session id instead of generating a custom one:
        //   https://www.drupal.org/node/2238561
        $this->setId(Crypt::randomBytesBase64());
        // Initialize the session global and attach the Symfony session bags.
        $_SESSION = [];
        $this->loadSession();
        // NativeSessionStorage::loadSession() sets started to TRUE, reset it to
        // FALSE here.
        $this->started = FALSE;
        $this->startedLazy = TRUE;
        $result = FALSE;
    }
    return $result;
}