dede织梦模板下载文档关键词维护“频率”的设置教程

function ReplaceKeyword($kw,&$body)   
{   
   global $cfg_cmspath;   
   $maxkey = 5;   
   $kws = explode(",",trim($kw)); //以分好为间隔符   
   $i=0;   
   $karr = $kaarr = $GLOBALS['replaced'] = array();   
   
   //暂时屏蔽超链接   
   $body = preg_replace("/()(.*)(<)(/a>)/isU", '1-]-4-[-6', $body);   
   
   global $dsql;   
   $query="SELECT * FROM keywords WHERE rpurl<>'' and sta=1 ORDER BY length(keyword)desc";   
   $dsql->SetQuery($query);   
   $dsql->Execute();   
   while($row = $dsql->GetArray())   
   {   
     $key = trim($row['keyword']);   
     $key_url=trim($row['rpurl']);   
     $karr[] = $key;   
     $kaarr[] = "$key";   
   }   
   foreach ($karr as $key => $word)   
   {   
   
    $body = preg_replace("/(^|>)([^<]+)(?=<|$)/sUe", "_highlight('2', $karr[$key], $kaarr[$key], '1')", $body);   
//echo $body."
";   
   
//恢复超链接   
    $body = preg_replace("/()/isU", '1>3<4', $body);   
//暂时屏蔽超链接   
    $body = preg_replace("/()(.*)(<)(/a>)/isU", '1-]-4-[-6', $body);   
   
   }   
   
   //恢复超链接   
   $body = preg_replace("/()/isU", '1>3<4', $body);   
   return $body;   
}   
   
}//End Archives   
   
//高亮专用, 替换多次是可能不能达到最多次   
function _highlight($string, $words, $result, $pre)   
{   
global $cfg_replace_num;   
$string = str_replace('"', '"', $string);   
   
if($GLOBALS['replaced'][$words] == 1)   
{   
   return $pre.$string;   
}   
   
if($cfg_replace_num > 0)   
{   
   $string = preg_replace("/".preg_quote($words)."/", $result, $string, $cfg_replace_num);   
   if(strpos($string, $words) !== false)   
   {   
    $GLOBALS['replaced'][$words] = 1;   
    //echo $words;   
   }   
   
}   
else   
{   
    $string = str_replace($words, $result, $string);   
}   
   
return $pre.$string;   
}