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| <?php mb\_internal\_encoding("UTF-8"); mb\_regex\_encoding("UTF-8"); class FullTextSearcher { var $markwords; var $scorequery; public function FullTextSearcher() { } public function search_sql($statement) { return "'". $this->to_ngram($statement, 2) ."' IN BOOLEAN MODE"; } public function getScore() { return "'".$this->scorequery."'"; } public function getMarkupWords() { return $this->markwords; } private function to_ngram($string, $n){ $string = mb\_ereg\_replace("^(\\s| )+","", $string); $string = mb\_ereg\_replace("(\\s| )+$","", $string); $str_array = preg_split("/(\\s| )+/", $string); $result = array(); $markwords = array(); $scores = array(); foreach ($str_array as $str){ if ('-' != substr($str, 0, 1)) { $markwords\[\] = $str; } $r = $this->to\_ngram\_query($str, $n); $result\[\] = $r\[0\]; $scores\[\] = $r\[1\]; } $this->markwords = $markwords; $this->scorequery = join(' ', $scores); return join(' ', $result); } private function to\_ngram\_query($string, $n){ $string = trim($string); if ($string == ''){ return ''; } if ('-' != substr($string, 0, 1)) { $plus = true; } else { $plus = false; $string = substr($string, 1); } $length = mb_strlen($string); if ($length < $n){ if ($plus) { return array("+".$string."*", $string); } else { return array("-".$string."*", ""); } } $ngrams = array(); $scores = array(); $wa = new WordsAnalyzer(); $wa->loadStr($string); $wds = $wa->get_indexes(); foreach ($wds as $ngram){ if ($plus) { $ngrams\[\] = "+" . $ngram; $scores\[\] = $ngram; } else { $ngrams\[\] = "-" . $ngram; } } return array(join(' ', $ngrams), join(' ', $scores)); } } class WordsAnalyzer { private $words; public function WordsAnalyzer() { } public function get_indexes() { return array_keys($this->words); } public function get_fulltext() { return join(' ', array_keys($this->words)); } public function loadStr($str) { $this->words = array(); ereg_replace(13, "", $str); ereg_replace(10, " ", $str); $this->analyze_token($this->split_token($str)); } private function split_token($str) { $token = array(); while (1) { $bytes = mb_ereg("\[一-龠\]+|\[ぁ-ん\]+|\[ァ-ヴー\]+|\[a-zA-Z0-9\]+|\[a-zA-Z0-9\]+", $str, $match); if ($bytes == FALSE) break; $match = $match\[0\]; array_push($token, $match); $pos = strpos($str, $match); $str = substr($str, $pos+$bytes); } return $token; } private function analyze_token($token) { for ($i = 0, $len = count($token); $i < $len; $i++) { $word = $token\[$i\]; if (mb_ereg("\[一-龠\]", $word, $match) != FALSE) { if (mb_strlen($word) > 1) { $this->japanese($word); } else { $this->addword($word); } } else if (mb_ereg("\[ぁ-ん\]", $word, $match) != FALSE) { if (mb_strlen($word) > 1) { $this->hiragana($word); } } else if (mb_ereg("\[ァ-ヴー\]", $word, $match) != FALSE) { if (mb_strlen($word) > 1) { $this->japanese($word); } } else if (mb_ereg("\[a-zA-Z0-9\]", $word, $match) != FALSE) { if (strlen($word) > 0) {
$this->english($word); } } else if (mb_ereg("\[a-zA-Z0-9\]", $word, $match) != FALSE) { if (mb_strlen($word) > 0) {
$word = mb\_convert\_kana($word, 'rn'); $this->english($word); } } else { $this->addword($word); } } } private function addword($word) { if (strlen($word) == 0) return; $this->words{$word} = true; } private function japanese($str) {
$ret = $this->split_ngram($str, 2); foreach ($ret as $key => $value) { if (mb_strlen($value) > 1) { $this->addword($value); } } } private function hiragana($str) {
$ret = $this->split_ngram($str, 2); foreach ($ret as $key => $value) { if (mb_strlen($value) > 1) { if (mb_ereg("っ.|を|です|ます|する|ある|いる|から", $value, $match) != FALSE) { } else { $this->addword($value); } } } } private function english($str) { $this->addword($str);
while(1){ $r = ereg("(\[a-z\]|\[A-z\]|\[0-9\])\[a-z\]+", $str, $match); if ($r == FALSE) { break; } $match = $match\[0\]; $this->addword($match); $pos = strpos($str, $match); $str = substr($str, $pos + $r); } } private function split_ngram($string, $n){ $ngrams = array(); $string = trim($string); if ($string == '') return ''; for ($i = 0, $len = mb_strlen($string); $i < $len; $i++) { $ngrams\[\] = mb_substr($string, $i, $n); } return $ngrams; } } ?>
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