ArticleIndex::AddKeyword PHP Method

    public static function AddKeyword(array &$p_keywordsHash, $p_kwd)
    {
        $p_kwd = trim($p_kwd);
        if (!isset($p_keywordsHash[$p_kwd])) {
            $p_keywordsHash[$p_kwd] = false;
        } else {
            $p_keywordsHash[$p_kwd] = true;
        }
    }