<"A:这是一个测试程序1";
$str= iconv("UTF-8","gb2312", $str);
echo $str."</br>";
$i=0;
while($i<strlen($str) ) {
  $tmp=bin2hex(substr($str,$i,1));
  if($tmp>='B0'){ //汉字的开始
    $t=getLetter(hexdec(bin2hex(substr($str,$i,2))));
    printf("%c",$t==-1 "%s",substr($str,$i,1));
    $i++;
  }
}
function getLetter($num){
  global $limit;
  $char_index=65;
  foreach($limit as $k=>$v){
    if($num>=$v[0] && $num<=$v[1]){
      $char_index+=$k;
      return $char_index;
    }
  }
  return -1;
}
?>