php正则获取网页关键字,代码如下:

function get_keywords($html){$html=strtolower($html);preg_match("@
      
       ]*>(.*?)@si",$html, $regs);$headdata = $regs[1];preg_match("/
       "]+)["']?/i", $headdata, $res);if (isset ($res)) {$keywords = $res[1];}if ($keywords == "") $keywords = "无";$keywords=replace_word(textcut($keywords,250));$keywords=str_replace("-",",",$keywords);$keywords=str_replace("，",",",$keywords);$keywords=str_replace(" ",",",$keywords);$keywords=str_replace("|",",",$keywords);$keywords=str_replace("、",",",$keywords);$keywords=str_replace(",,",",",$keywords);$keywords=str_replace("<","",$keywords);$keywords=str_replace(">","",$keywords);return addslashes(trim($keywords));}
      

　　

php正则获取网页标题,代码如下

function get_title($html){  $html=strtolower($html); $title = str_replace(" - ",",",cut($html,"" ));//if ($title == "") $title = "无标题";if ($title) $title=replace_word(textcut($title,80));if ($title) $title=preg_replace("/<(.*?)>/","",$title);return addslashes(trim($title));}

　　

php正则获取网页描述description,代码如下

function get_description($html){$html=strtolower($html);preg_match("@
      
       ]*>(.*?)@si",$html, $regs);$headdata = $regs[1];preg_match("/
       "]+)["']?/i", $headdata, $res);      if (isset ($res)) {       $description = $res[1];      }if ($description == "") $description = "无";$description=replace_word(textcut($description,250));$description=str_replace("-",",",$description);$description=str_replace("，",",",$description);$description=str_replace(" ",",",$description);$description=str_replace("|",",",$description);$description=str_replace("、",",",$description);$description=str_replace(",,",",",$description);$description=str_replace("<","",$description);$description=str_replace(">","",$description);return addslashes(trim($description));}