PHP版本高于5.5无法使用关键词內链的解决方法

$body = @preg_replace_callback("#(^|>)([^<]+)(?=<|$)#sU", "_highlight('\\2', \$karr, \$kaarr, '\\1')", $body);

global $cfg_replace_num;if($cfg_replace_num > 0) {	$query = "SELECT char_length(keyword) AS num,aid,keyword,rpurl,rank FROM dede_keywords WHERE rpurl<>'' ORDER BY num DESC"; 	$this->dsql->SetQuery($query); 	$this->dsql->Execute(); 	while($row = $this->dsql->GetArray()) 	{		$key = trim($row['keyword']); 		$key_url=trim($row['rpurl']); 		$body = str_replace_limit($key, "<a href='$key_url' target='_blank'><u>$key</u></a>", $body, $cfg_replace_num); 	}
}
else
{	$query = "SELECT char_length(keyword) AS num,aid,keyword,rpurl,rank FROM dede_keywords WHERE rpurl<>'' ORDER BY num DESC"; 	$this->dsql->SetQuery($query); 	$this->dsql->Execute(); 	while($row = $this->dsql->GetArray()) 	{		$key = trim($row['keyword']); 		$key_url=trim($row['rpurl']); 		$body = str_replace($key, "<a href='$key_url' target='_blank'><u>$key</u></a>", $body); 	}
}

//高亮专用

//指定替换次数功能 
function str_replace_limit($search, $replace, $subject, $limit) {
	if(is_array($search))
	{
		foreach($search as $k=>$v)
		{
			$search[$k] = '#(?<!>)(?!<)'. preg_quote($search[$k], '#'). '#';
		}
	}
	else 	{
		$search = '#(?<!>)(?!<)'. preg_quote($search, '#'). '#';
	}
	return preg_replace($search, $replace, $subject, $limit);
}