PHP 抽取网页标题并剔除不相关的seo关键字
场景描述:
过往我们在抽取网页标题的时候，都会直接抽取 之间的内容. 但实际情况是这样,例如javaeye 的一篇文章 http://www.iteye.com/news/21643 , 的内容为 "10年软件开发教会我最重要的10件事 - 非技术 - ITeye资讯", 但实际引用中我们期望的标题应该为 "10年软件开发教会我最重要的10件事". 所以标题后面堆砌了很多不相关的关键字(应该是为了 seo 吧). 所以我们希望过滤掉这些关键字. 有下面的方法可以参考:
1. 查找 h1 等标签.(分析sina news 一些网站之后, 觉得不可行,会有很多干扰)
2. 从全文去标题后，将 之间的内容切割(按 _ | -)为 a1,a2,a3,a4，然后从最长的词组a3开始从全文查找. 如果查找成功,那么开始向左边迭代查询 a2,a1,直到查询失败为止 。左侧失败后，再继续向右迭代，同理. (这里我采用的是这种方法)
* @date: 2011-06-18 * Description: 给定一个网页内容，提取网页的标题. 提取的标题不包括 seo 关键字. * e.g: 一篇新闻标题的从直接抽取结果为 "大学英语四六级本周六开考 909万人参考_新浪教育_新浪网", * 但我们希望的结果是:"大学英语四六级本周六开考 909万人参考". * 适用范围: 文章最终页标题的提取, 不包括专题页等. */class TitlePurify{ private $matches_preg = '[-_\s|—]'; function getTitle($contents){/*{{{*/ $preg = "/<title[^>]*>([\w|\t|\r|\W]*?)<\/title>/i"; preg_match($preg, $contents, $matches); if(count($matches)<=1){ return "标题抽取失败"; } $title = $matches[1]; return $this->trimTitle($title, $contents); }/*}}}*/ function trimMeta($contents){/*{{{*/ // 首先去除 <title> 内容, <meta> 内容. $preg = "/<title[^>]*>([\w|\t|\r|\W]*?)<\/title>/i"; $contents = preg_replace($preg, '', $contents); $preg = "/<meta[^>]*>/i"; $contents = preg_replace($preg, '', $contents); return $contents; }/*}}}*/ // 获取长度最长的 item?所处的index. function getMaxIndex($titles){/*{{{*/ $maxItemIndex = 0; $maxLength = 0; $loop = 0; foreach($titles as $item){ if(strlen($item)>$maxLength){ $maxLength = strlen($item); $maxItemIndex = $loop; } $loop++; } return $maxItemIndex; }/*}}}*/ function trim($title, $titles, $contents, $maxItemIndex){/*{{{*/ [email protected] : 此处可优化contents // 如果查找成功. result = tempTitle. $tempTitle = $titles[$maxItemIndex]; $result = $tempTitle; $count = count($titles); // while 从当前index 向左进行迭代(直到到达第一个或者匹配失败才中止). $leftIndex = $maxItemIndex-1; while(true && $leftIndex>=0){ // tempTitle+左一个. preg_match("/({$this->matches_preg}+{$tempTitle})/i", $title, $matches); if(count($matches)>1){ // temp 用于匹配失败后,进行回滚. $temp = $titles[$leftIndex] . $matches[1]; $tempTitle = $titles[$leftIndex] . $matches[1]; // 继续拿着 tempTitle 去匹配. preg_match("/$tempTitle/i", $contents, $matches); // 如果查找失败.... if(count($matches)<1){ $tempTitle = $temp; break; }else{ $result = $tempTitle; } }else{ //?正常情况下,?不会出现该情况. break; } $leftIndex--; } // match(current[i-1].[|-].tempTitle), 如果成功, tempTitle = match 成功的值,继续. // while 左边失败后, 从右边开始. $rightIndex = $maxItemIndex+1; while(true && ($rightIndex<=$count)){ preg_match("/({$tempTitle}{$this->matches_preg}+)/i", $title, $matches); if(count($matches)>1){ // temp 用于匹配失败后,进行回滚. $temp = $matches[1] . $titles[$rightIndex]; $tempTitle = $matches[1] . $titles[$rightIndex]; // 继续拿着 tempTitle 去匹配. preg_match("/$tempTitle/i", $contents, $matches); // 如果查找失败.... if(count($matches)<1){ $tempTitle = $temp; break; }else{ $result = $tempTitle; } }else{ //?正常情况下,?不会出现该情况. break; } $rightIndex++; } return $result; }/*}}}*/ function trimTitle($title, $contents){/*{{{*/ $contents = $this->trimMeta($contents); // 配置切割标题的规则. $titles = preg_split("/$this->matches_preg/i", $title); $count = count($titles); //var_dump($titles);exit; // 将当前最长的 item 从全文查找. $maxItemIndex = $this->getMaxIndex($titles); $tempTitle = $titles[$maxItemIndex]; preg_match("/$tempTitle/i", $contents, $matches); // 如果查找失败.... if(count($matches)<1){ return $title; } return $this->trim($title, $titles, $contents, $maxItemIndex); }/*}}}*/}// ------------- test code ------------------------------function convertEncoding($contents){ preg_match("/charset=([\w|\-]+);?/i", $contents, $match); $charset = isset($match[1])? $match[1] : 'UTF-8'; $contents = mb_convert_encoding($contents, 'UTF-8', $charset); return $contents;}$url = 'http://china.nba.com/news/4/2011/0617/61383331/10451.html';$contents = file_get_contents($url);$contents = convertEncoding($contents);$startTime = microtime();$purify = new TitlePurify();$title = $purify->getTitle($contents);$endTime = microtime();echo "标题: $title ";echo "cost: " . 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