Traditional Chinese language pack PHP function that converts Simplified Chinese to Traditional Chinese

Thanks to netizen Keyes for providing the Delphi source code for transplantation. The calling method is $txt=gbtobig5($txt).
(Note: include "data_gb.php" in the source code; this file is an array at http://caocao.oso.com.cn/data_gb.zip. Please edit and download it to oso and make a 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 isgb($code)
{
if (strlen($code)>=2)
{
       $code=strtok($code,"");
         if ((ord($code[0]) < 161)||(ord($code[0]) >= 247))
                                                                                                                                                                                                        ​(0);
}
else
{
if ((ord($code[1]) <= 161)||(ord($code[1]) >= 254))
{
return (0 ;
}
}
function gboffset($code)
{
if (strlen($code ) >= 2)
{
$code=strtok($code,"");
return ((ord($code[0]) - 161) * 94 + (ord($code[1]) - 161 ));
}
else
{
return(-1);
}
}
function wordtostring($code)
{
return (chr(hexdec(substr($code,0,2)))).chr( hexdec(substr($code,2,2))));
}
function gbtobig5($code)
{
include "data_gb.php";
$output="";
$length=strlen($code) ;
$code=strtok($code,"");
$idx=0;
while ($idx < $length)
{
$tmpStr=$code[$idx].$code[$idx+1 ];
if (isgb($tmpStr))
{
$offset=gboffset($tmpStr);
if (($offset >= 0)||($offset <= 8177))
{ $output .=wordtostring($gborder[$offset]);
                                                   
else
{
$output.= $code[ $idx];
}
$idx++;
}
return ($output);
};
?>

The above introduces the Traditional Chinese language pack and the PHP function for converting Simplified Chinese to Traditional Chinese, including the content of the Traditional Chinese language pack. I hope it will be helpful to friends who are interested in PHP tutorials.