php使用xapian扩展时获取某篇文档的分词及词频

		$terms = array();
		$prefix = 'Z';
		for ($termi = $doc->termlist_begin(); !$termi->equals($doc->termlist_end()); $termi->next()) {
            $term = array(
				'wdf' => $termi->get_wdf(),
                'freq' => $termi->get_termfreq(),
                'name' => $termi->get_term(),
            );
            if ($term['name'][0] === $prefix) {
				$term['name'] = substr($term['name'],1,strlen($term['name'])-1);
                $terms[] = $term;
            }
        }