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session_start();//старт сессии
// todo логика проверки смены пользователя
	$username = null;
	$reqHeaders = apache_request_headers();
	
	if(isset($reqHeaders['Authorization'])){
    		$matches = array();
    		preg_match('/username="(\w+)"/', $reqHeaders['Authorization'], $matches);
    		if(isset($matches[1])){
      			$username = $matches[1];
    		}
		if ( $_SESSION['username'] != $username )
			$_SESSION['userIsChange'] = "true";
		else
			$_SESSION['userIsChange'] = "false";

		$_SESSION['username'] = $username;
  	}