3.8、gbk转拼音

/**
 * gbk转拼音
 * @param $txt
 */
function gbk_to_pinyin($txt) {
   if(CHARSET != 'gbk') {
      $txt = iconv(CHARSET,'GBK',$txt);
   }  
   $l = strlen($txt);
   $i = 0;
   $pyarr = array();
   $py = array();
   $filename = CODETABLEDIR.'gb-pinyin.table';
   $fp = fopen($filename,'r');
   while(!feof($fp)) {
      $p = explode("-",fgets($fp,32));
      $pyarr[intval($p[1])] = trim($p[0]);
   }
   fclose($fp);
   ksort($pyarr);
   while($i<$l) {
      $tmp = ord($txt[$i]);
      if($tmp>=128) {
         $asc = abs($tmp*256+ord($txt[$i+1])-65536);
         $i = $i+1;
      } else $asc = $tmp;
      $py[] = asc_to_pinyin($asc,$pyarr);
      $i++;
   }
   return $py;
}