十亿以内数字转中文

/**
     * 数字转化成对应的汉字 mun2ch( 1 );
     * @param  $num
     * @return string
     */
    public function num2ch($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;
    }

$res = $this->num2ch(242514242);
var_dump($res);   //二亿四千二百五十一万四千二百四十二
die;

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