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由于SQL正则替换不支持反向引用使用PHP读取替换并重新写入数据库：

<?php
$db = 'typecho';
$user = 'root';
$pass = 'password';
try { 
  $dbo = new PDO('mysql:host=localhost;dbname='.$db, $user, $pass, array(PDO::MYSQL_ATTR_INIT_COMMAND => "SET NAMES 'utf8';"));
} catch (PDOException $e) { 
  $error = $e->getMessage();
  die("PDO Execute Error : ".$error."\n");       
}
$dbo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);

$sql = "SELECT cid,text FROM typecho_contents";
$stmt = $dbo->query($sql);
//$result = $stmt->fetch(PDO::FETCH_ASSOC);
//var_dump($result);
while (list($cid,$text)=$stmt->fetch(PDO::FETCH_NUM)){
  echo $cid."\n";
  $pattern = "/<code\s+?lang=[\'\"](\w+?)[\'\"]>/i";
  //preg_match($pattern, $text, $matches);
  //print_r($matches);
  $text = preg_replace($pattern, "```\$1", $text);
  $text = preg_replace('/<code>/', "```", $text);
  $text = preg_replace('/<\/code>/', "```", $text);
  $text = preg_replace('/^/', '<!--markdown-->', $text);
  $st = $dbo->prepare("UPDATE typecho_contents set `text` = ? where cid = ?");
  $st->bindParam(1, $text);
  $st->bindParam(2, $cid);
  $st->execute();
}

<?php
   function hexchar2bin($str)
   {
      $arr = '';
      $temp = null;
      for ($i = 0; $i < strlen($str); $i = $i + 2) {
         $arr .= "\\x" . substr($str, $i, 2);
      }
      eval('$temp="' . $arr . '";');
      return $temp;
   }

   function getUid($uid)
   {
      $temp = null;
      eval('$temp="' . $uid . '";');
      return $temp;
   }
   function getEncryption($password, $uin, $vcode)
   {
      $uin = getUid($uin);
      $str1 = hexchar2bin(strtoupper(md5($password)));
      $str2 = strtoupper(md5($str1 . $uin));
      return strtoupper(md5($str2 . strtoupper($vcode)));
   }
   //print_r(getEncryption('passwd','\x00\x00\x00\x00\xba\xaf\x34\x87','!GMO'));

   function utf8_unicode($c)
   {
      switch (strlen($c)) {
         case 1:
         return ord($c);
         case 2:
         $n = (ord($c[0]) & 0x3f) << 6;
         $n += ord($c[1]) & 0x3f;
         return $n;
         case 3:
         $n = (ord($c[0]) & 0x1f) << 12;
         $n += (ord($c[1]) & 0x3f) << 6;
         $n += ord($c[2]) & 0x3f;
         return $n;
         case 4:
         $n = (ord($c[0]) & 0x0f) << 18;
         $n += (ord($c[1]) & 0x3f) << 12;
         $n += (ord($c[2]) & 0x3f) << 6;
         $n += ord($c[3]) & 0x3f;
         return $n;
      }
   }

   function getGTK($str)
   {
      $hash = 5381;
      for ($i = 0, $len = strlen($str); $i < $len; ++$i) {
         $hash += ($hash << 5) + utf8_unicode($str[$i]);
      }
      return $hash & 2147483647;
   }
   print_r(getGTK('@LNKTSNI0F'));

另一种g_tk的算法：

<?php

function charCodeAt($str, $index)
{
  $char = mb_substr($str, $index, 1, 'UTF-8');

  if (mb_check_encoding($char, 'UTF-8'))
  {
    $ret = mb_convert_encoding($char, 'UTF-32BE', 'UTF-8');
    return hexdec(bin2hex($ret));
  }
  else
  {
    return null;
  }
}

function getGTK($str)
{
  $md5key = 'tencentQQVIP123443safde&!%^%1282';
  $salt = 5381;
  $hash = $salt << 5;
  for ($i = 0, $len = strlen($str); $i < $len; ++$i) 
  {
    $asciicode = charCodeAt($str[$i], 0);
    $hash = $hash . (($salt << 5) + $asciicode);
    $salt = $asciicode;
  }
  return md5($hash . $md5key);
}
echo getGTK('AYg8iSVJL58F4X2EHBbIT5BS');

如淘宝/土豆/github图标乱码，使用stylish规则替换全局字体：

   
    /*强制全局雅黑 */  
    @-moz-document url-prefix(http://),url-prefix(https://),url-prefix(ftp://),url-prefix(file://){
    *{
         font-family:  verdana,"Microsoft YaHei",sans-serif !important;
     }

     pre, code, kbd, samp, var {
        font-family: "DejaVu Sans Mono", "Microsoft YaHei  Mono", monospace !important;
     }
    }

    /*土豆网*/
    @-moz-document domain('tudou.com'){
    *{
        font-family:  "Microsoft Yahei",tuiicon !important;
      }
    }

    /*淘宝*/
    @-moz-document domain('taobao.com'){
    *{
        font-family:  verdana,"Microsoft Yahei",tb-fp-iconfont,arial !important;
      }
    }

    /*github*/
    @-moz-document domain('github.com'){
    *{
        font-family:  "Microsoft Yahei",octicons !important;
      }
    }

Firefox29版本后使用了全新的界面并移除状态栏，导致工具栏图标较多且难看，找了几个插件恢复之前的状态栏图标：
The Addon Bar，恢复状态栏至浏览器下方。
The Puzzle Piece，功能强大，可恢复至地址栏，浏览器下方，下方最小化。
url-addon-bar，目前在使用这个，将状态栏移到地址栏。