else $strRet .= "??";
        $i++;
    } else {
        $strRet .= $strGB{$i};
    }
  }
  return $strRet;
}
function GB2UTF8_FILE($strGB) {
  if (!trim($strGB)) return $strGB;
  $arrLines = file("gb_unicode.txt");
  foreach ($arrLines as $strLine) {
    $arrCodeTable[hexdec(substr($strLine, 0, 6))] = hexdec(substr($strLine, 7, 6));
  }
  $strRet = "";
  $intLen = strlen($strGB);
  for ($i = 0; $i < $intLen; $i++) {
    if (ord($strGB{$i}) > 127) {
        $strCurr = substr($strGB, $i, 2);
        $intGB = hexdec(bin2hex($strCurr)) - 0x8080;
        if ($arrCodeTable[$intGB]) $strRet .= u2utf8($arrCodeTable[$intGB]);
        else $strRet .= "??";
        $i++;
    } else {
        $strRet .= $strGB{$i};
    }
  }
  return $strRet;
}
function EncodeIp($strDotquadIp) {
  $arrIpSep = explode('.', $strDotquadIp);
  if (count($arrIpSep) != 4) return 0;
  $intIp = 0;  
  foreach ($arrIpSep as $k => $v) $intIp += (int)$v * pow(256, 3 - $k);
  return $intIp;
  //return sprintf('%02x%02x%02x%02x', $arrIpSep[0], $arrIpSep[1], $arrIpSep[2], $arrIpSep[3]);
}
function GetMicroTime() {
  list($msec, $sec) = explode(" ", microtime());
  return ((double)$msec + (double)$sec);
}
for ($i = 0; $i < 100; $i++) { // 随机产生100个ip地址
  $strIp = mt_rand(0, 255).".".mt_rand(0, 255).".".mt_rand(0, 255).".".mt_rand(0, 255);
  $arrAddr[$i] = ip2addr(EncodeIp($strIp));
}
$resConn = mysql_connect("localhost", "netnest", "netnest");
mysql_select_db("test");
// 测评MySQL查询的编码转换
$dblTimeStart = GetMicroTime();
for ($i = 0; $i < 100; $i++) {
  $strUTF8Region = GB2UTF8_SQL($arrAddr[$i]["region"]);
  $strUTF8Address = GB2UTF8_SQL($arrAddr[$i]["address"]);
}
$dblTimeDuration = GetMicroTime() - $dblTimeStart;
// 测评结束并输出结果
echo $dblTimeDuration; echo "\r\n";
// 测评文本文件查询的编码转换
$dblTimeStart = GetMicroTime();
for ($i = 0; $i < 100; $i++) {
  $strUTF8Region = GB2UTF8_FILE($arrAddr[$i]["region"]);