将数字转化成对应的汉字

/**
  * 数字转化成对应的汉字 mun2ch( 1 );
  * @param unknown $num
  * @param string $mode
  * @return string  
  */
 
 public function num2ch($num) //整体读取转换
 {
  $num_real = $this->del0($num);//去掉前面的“0”
  $numlen = strlen($num_real);
 
  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 ;
 }
 
 public function del0($num) //去掉数字段前面的0
 {
  return "".intval($num);
 }
 
 public 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];
 }
 
 
 public 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;
 }