Filter::getTabId

static function getTabId(bool $increment = true): int
{
	$tabId = 0;
	if (isset($_SESSION[self::STORAGE_TAB_CNT]))
	{
		$tabId = $_SESSION[self::STORAGE_TAB_CNT];
	}
	if ($increment)
	{
		$tabId ++;
		$_SESSION[self::STORAGE_TAB_CNT] = $tabId;
	}

	return $tabId;
}