ucenter中词语过滤原理分析

//private
function _get_badwords() {
  $data = $this->db->fetch_all("SELECT * FROM ".UC_DBTABLEPRE."badwords");
  $return = array();
  if(is_array($data)) {
    foreach($data as $k => $v) {
      $return['findpattern'][$k] = $v['findpattern'];
      $return['replace'][$k] = $v['replacement'];
    }
  }
  return $return;
}

$_CACHE['badwords'] = $this->base->cache('badwords');
if($_CACHE['badwords']['findpattern']) {
  $subject = @preg_replace($_CACHE['badwords']['findpattern'], $_CACHE['badwords']['replace'], $subject);
  $message = @preg_replace($_CACHE['badwords']['findpattern'], $_CACHE['badwords']['replace'], $message);
}