function keylinks($txt, $replacenum = '')
{
$linkdatas =
cache_read('keylink.php','',1);

//暫時屏蔽超鏈接
$txt
= preg_replace("/(<a(.*))(>)(.*)(<)(/a>)/isU", '1-]-4-[-6',
$txt);

$GLOBALS['replaced'] = array();

if($linkdatas)
{
  $word = $replacement =
array();
  foreach($linkdatas as
$v)
  {
   $word[] =
$v[0];
   $GLOBALS['replaced'][$v[0]] =
0;
   $replacement[] = '<a href="'.$v[1].'" target="_blank"
class="keylink">'.$v[0].'</a>';
  }
}
$txt
= preg_replace("/(^|>)([^<]+)(?=<|$)/sUe", "_highlight('2', $word,
$replacement, '1',$replacenum)", $txt);

//恢復超鏈接 liehuo.net
$txt =
preg_replace("/(<a(.*))-]-(.*)-[-(/a>)/isU", '1>3<<A
href="file://4'">4', $txt);
return $txt;
}

//高亮專用, 替換多次是可能不能達到最多次
function _highlight($string, $words, $result,
$pre ,$cfg_replace_num)
{
$string = str_replace('"', '"',
$string);
if($cfg_replace_num > 0)
{
  foreach
($words as $key =>
$word)
  {
   if($GLOBALS['replaced'][$word] ==
1)
   {
    continue;
   }
   $string
= preg_replace("/".preg_quote($word)."/", $result[$key], $string,
$cfg_replace_num);
   if(strpos($string, $word) !==
false)
   {
    $GLOBALS['replaced'][$word]
=
1;
   }
  }
}
else
{
  $string
= str_replace($words, $result, $string);
}
return
$pre.$string;
}