public function normalize_keywords(array $keywords) { $normalized = parent::normalize_keywords($keywords); $callback = "stemword"; $tagger = __NAMESPACE__ . '\\POS\\' . ucfirst($this->lang) . '\\Tagger'; if (is_callable($callback)) { return array_map(function ($keyword) use($callback) { return $callback($keyword, 'french', 'UTF_8'); }, $normalized); } return $normalized; }