PHP function to convert Traditional Chinese to Simplified Chinese_PHP tutorial

A few days ago, I asked on the oso forum if there was such a source program, but no one responded. I finally made up my mind to transplant such a function. Thanks to netizen Keyes for providing the Delphi source code for transplantation. The calling method is $txt=big5togb($txt).
(Note: include "data_big5.php" in the source code; this file is an array at http://caocao.oso.com.cn/data_big5.zip. Please edit and download it to oso to make an link, because I will delete this file in a few days.）

/***********************************************************************
                       Written by caocao
                       caocao@eastday.com
                       http://caocao.oso.com.cn

                       With the help of Keyes
                       Keyes2000@263.net
                       http://my-wjl.scu.edu.cn/~Keyes
***********************************************************************/
function isbig5($code)
{
  if (strlen($code)>=2)
  {
    $code=strtok($code,"");

    if (ord($code[0]) < 161)
    {
      return (0);
    }
    else
    {
      if (((ord($code[1]) >= 64)&&(ord($code[1]) <= 126))||((ord($code[1]) >= 161)&&(ord($code[1]) <= 254)))
      {
        return (1);
      }
      else
      {
        return (0);
      }
    }
  }
  else
  {
    return (0);
  }
}

function big5offset($code)
{
  if (strlen($code) >= 2)
  {
    $code=strtok($code,"");
    if ((ord($code[1]) >= 64)&&(ord($code[1]) <= 126))
    {
      return ((ord($code[0]) - 161) * 157 + (ord($code[1]) - 64));
    }
    if ((ord($code[1]) >= 161)&&(ord($code[1]) <= 254))
    {
      return ((ord($code[0]) - 161) * 157 + 63 + (ord($code[1]) - 161));
    }
  }
  return (-1);
}

function wordtostring($code)
{
  return (chr(hexdec(substr($code,0,2))).chr(hexdec(substr($code,2,2))));
}

function big5togb($code)
{
  include "data_big5.php";
  $output="";
  $length=strlen($code);
  $code=strtok($code,"");
  $idx=0;
  while ($idx < $length)
  {
    $tmpStr=$code[$idx].$code[$idx+1];

    if (isbig5($tmpStr))
    {
      $offset=big5offset($tmpStr);
      if (($offset >= 0)||($offset <= 14757))
      {
        $output.=wordtostring($big5order[$offset]);
        $idx++;
      }
      else
      {
        $output.= $code[$idx];
      }
    }
    else
    {
      $output.= $code[$idx];
    }
    $idx++;
  }
  return ($output);
}
?>  

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