/**
* @return mixed|null|string
*/
public static function sessionID()
{
if (!self::$_sessionID) {
$session = CRM_Core_Session::singleton();
self::$_sessionID = $session->get('qfSessionID');
if (!self::$_sessionID) {
self::$_sessionID = session_id();
$session->set('qfSessionID', self::$_sessionID);
}
}
return self::$_sessionID;
}
