dede织梦模板文档关键词维护“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;   
}