php金钱显示小写转大写

以下代码是在网上找的，具体出处忘了

    class numToUpper{
      function del0($num){ //去掉数字段前面的0
        return "".intval($num);
      }

      function n2c($x){  //单个数字变汉字
        $arr_n = array("零","一","二","三","四","五","六","七","八","九","十");
        return $arr_n[$x];
      }

      function num_r($abcd){ //读取数值（4位）
        $arr= array();
        $str = ""; //读取后的汉字数值
        $flag = 0; //该位是否为零
        $flag_end = 1; //是否以“零”结尾
        $size_r = strlen($abcd);
        for($i=0; $i<$size_r; $i++) {
          $arr[$i] = $abcd{$i};
        }
        $arrlen = count($arr);
        for($j=0; $j<$arrlen; $j++) {
          $ch = $this->n2c($arr[$arrlen-1-$j]); //从后向前转汉字
          if($ch == "零" && $flag == 0){ //如果是第一个零
            $flag = 1; //该位为零
            $str = $ch.$str; //加入汉字数值字符串
            continue;
          }elseif($ch == "零"){ //如果不是第一个零了
            continue;
          }
          $flag = 0; //该位不是零
          switch($j) {
            case 0: $str = $ch; $flag_end = 0; break; //第一位（末尾），没有以“零”结尾
            case 1: $str = $ch."十".$str; break; //第二位
            case 2: $str = $ch."百".$str; break; //第三位
            case 3: $str = $ch."千".$str; break; //第四位
          }
        }
        if($flag_end == 1){ //如果以“零”结尾
          mb_internal_encoding("UTF-8");
          $str = mb_substr($str, 0, mb_strlen($str)-1); //把“零”去掉
        }
        return $str;
      }
      function num2ch($num){ //整体读取转换
        $num_real = $this->del0($num);//去掉前面的“0”
        $numlen = strlen($num_real);
        //echo "numlen=".$numlen."";
        $a = $b = $c = '';
        if($numlen >= 9){//如果满九位，读取“亿”位
          $y=substr($num_real, -9, 1);
          //echo $y;
          $wsbq = substr($num_real, -8, 4);
          $gsbq = substr($num_real, -4);
          $a = $this->num_r($this->del0($gsbq));
          $b = $this->num_r($this->del0($wsbq))."万";
          $c = $this->num_r($this->del0($y))."亿";
        }elseif($numlen <= 8 && $numlen >= 5){ //如果大于等于“万”
          $wsbq = substr($num_real, 0, $numlen-4);
          $gsbq = substr($num_real, -4);
          $a = $this->num_r($this->del0($gsbq));
          $b = $this->num_r($this->del0($wsbq))."万";
          $c="";
        }elseif($numlen <= 4){ //如果小于等于“千”
          $gsbq = substr( $num_real, -$numlen);
          $a = $this->num_r($this->del0($gsbq));
          $b="";
          $c="";
        }
        $ch_num = $c.$b.$a;
        return $ch_num;
      }
    }