php各种编码转换实现代码(1/6)

$uc2gbtable = $codetable = $big5_data = $gb_data = '';
$gbkunidic = null;

//utf-8 转gb编码
function utf82gb($utfstr)
{
 if(function_exists('iconv'))
 {
  return iconv('utf-8','gbk//ignore',$utfstr);
 }
 global $uc2gbtable;
 $okstr = "";
 if(trim($utfstr)=="")
 {
  return $utfstr;
 }
 if(empty($uc2gbtable))
 {
  $filename = dedeinc."/data/gb2312-utf8.dat";
  $fp = fopen($filename,"r");
  while($l = fgets($fp,15))
  {
   $uc2gbtable[hexdec(substr($l, 7, 6))] = hexdec(substr($l, 0, 6));
  }
  fclose($fp);
 }
 $okstr = "";
 $ulen = strlen($utfstr);
 for($i=0;$i<$ulen;$i++)
 {
  $c = $utfstr[$i];
  $cb = decbin(ord($utfstr[$i]));
  if(strlen($cb)==8)
  {
   $csize = strpos(decbin(ord($cb)),"0");
   for($j=0;$j < $csize;$j++)
   {
    $i++; $c .= $utfstr[$i];
   }
   $c = utf82u($c);
   if(isset($uc2gbtable[$c]))
   {
    $c = dechex($uc2gbtable[$c]+0x8080);
    $okstr .= chr(hexdec($c[0].$c[1])).chr(hexdec($c[2].$c[3]));
   }
   else
   {
    $okstr .= "&#".$c.";";
   }
  }
  else
  {
   $okstr .= $c;
  }
 }
 $okstr = trim($okstr);
 return $okstr;
}

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