protected function getFilterFieldValue(): string
    {
        if (isset($_SESSION[SlimPostgres::SESSION_KEY_ADMIN_LIST_VIEW_FILTER][$this->getFilterKey()][self::SESSION_FILTER_VALUE_KEY])) {
            return $_SESSION[SlimPostgres::SESSION_KEY_ADMIN_LIST_VIEW_FILTER][$this->getFilterKey()][self::SESSION_FILTER_VALUE_KEY];
        } else {
            return '';
        }
    }
protected function getFilterFieldValue(): string
    {
        if (isset($_SESSION[SlimPostgres::SESSION_KEY_ADMIN_LIST_VIEW_FILTER][$this->getFilterKey()][self::SESSION_FILTER_VALUE_KEY])) {
            return $_SESSION[SlimPostgres::SESSION_KEY_ADMIN_LIST_VIEW_FILTER][$this->getFilterKey()][self::SESSION_FILTER_VALUE_KEY];
        } else {
            return '';
        }
    }
protected function getFilterFieldValue ( ) : string { if ( isset ( $ _SESSION [ SlimPostgres :: SESSION_KEY_ADMIN_LIST_VIEW_FILTER ] [ $ this -> getFilterKey ( ) ] [ self :: SESSION_FILTER_VALUE_KEY ] ) ) { return $ _SESSION [ SlimPostgres :: SESSION_KEY_ADMIN_LIST_VIEW_FILTER ] [ $ this -> getFilterKey ( ) ] [ self :: SESSION_FILTER_VALUE_KEY ] ; } else { return '' ; } }
either session value or empty string
either session value or empty string