日本語WordNetの辞書(SQLite3)から同義語を取り出す。

WN4P.php

<?php
class WN4P {
	private $db;

	public function __construct($dict) {
		try {
			$this->db = new SQLite3($dict, SQLITE3_OPEN_READONLY);
		} catch (Exception $e) {
			throw new Exception("Unable to connect to the SQLite3 database: ".$dict);
		}
	}

	public function close() {
		$this->db->close();
	}

	public function __destruct() {
		$this->close();
	}

	public function getSynonyms($word, $lang=null) {
		$synonyms = array();
		$words = $this->getWords($word);
		$senses = $this->getSensesByWordId($words[0]['wordid']);
		foreach($senses as $sens) {
			$wordIdArray = $this->getSensesBySynset($sens['synset'], $lang);
			foreach($wordIdArray as $wordid) {
				$synonym = $this->getWord($wordid['wordid']);
				$synonyms[] = $synonym[0]['lemma'];
			}
		}
		return $synonyms;
	}

	private function getWords($lemma) {
		return $this->getRows("select wordid from word where lemma = :lemma", array(':lemma'=>$lemma));
	}

	private function getWord($wordid) {
		return $this->getRows("select lemma from word where wordid = :wordid", array(':wordid'=>$wordid));
	}

	private function getSensesByWordId($wordid) {
		return $this->getRows("select synset from sense where wordid = :wordid", array(':wordid'=>$wordid));
	}

	private function getSensesBySynset($synset, $lang) {
		if (!empty($lang)) {
 			return $this->getRows("select wordid from sense where synset = :synset and lang = :lang",
 								array(':synset'=>$synset, ':lang'=>$lang));
		} else {
			return $this->getRows("select wordid from sense where synset = :synset", array(':synset'=>$synset));
		}
	}

	private function getRows($sql, $params) {
		$stmt = $this->db->prepare($sql);
		foreach($params as $param=>$value) {
			$stmt->bindValue($param, $value);
		}
		$result = $stmt->execute();
		$rows = array();
		while($res = $result->fetchArray(SQLITE3_ASSOC)){
			$rows[] = $res;
		}
		return $rows;
	}
}
?>