php计算title标题相似比的方法

<?php /* * * @param string $title_1 题目1 * @param string $title_2 题目2 * @return float $percent 相似百分比 */function title_similar($title_1,$title_2) {  $title_1 = get_real_title($title_1);  $title_2 = get_real_title($title_2);  similar_text($title_1, $title_2, $percent);  return $percent;}/** * php采集文章题目并去版权 * @param string $html 需要采集的html源代码 * @return string */function get_real_title($str){  $str = str_replace(array('-','―','|'),'_',$str);  $splits = explode('_', $str);  $l = 0;  foreach ($splits as $tp){    $len = strlen($tp);    if ($l < $len){$l = $len;$tt = $tp;}  }  $tt = trim(htmlspecialchars($tt));  return $tt;}//以下是测试$title_1 = '代号PHPCMS V9产品正式发布公测版本';$title_2 = 'PHPCMS再战江湖 V9产品正式发布公测版本';$percent = title_similar($title_1,$title_2);echo '相似百分比：'.$percent.'%';echo "<br />/n";?>