PHP实现金额数字转换成大写函数

<?php
header("Content-Type:text/html;charset=utf-8");

        function num_to_upper($num)
        {
            $d = array('零','壹','贰','叁','肆','伍','陆','柒','捌','玖');
            $e = array('元','拾','佰','仟','万','拾万','佰万','仟万','亿','拾亿','佰亿','仟亿','万亿');
            $p = array('分','角');
            $zheng='整'; //追加"整"字
            $final = array(); //结果
            $inwan=0; //是否有万
            $inyi=0; //是否有亿
            $len_pointdigit=0; //小数点后长度
            $y=0;
            if($c = strpos($num, '.')) {    //有小数点,$c为小数点前有几位数
                $len_pointdigit = strlen($num)-strpos($num, '.')-1; // 判断小数点后有几位数
                if($c>13) { //简单的错误处理
                    echo "数额太大,已经超出万亿.";
                    die();
                } elseif($len_pointdigit>2) {   //$len_pointdigit小数点后有几位
                    echo "小数点后只支持2位.";
                    die();
                }
            } else {    //无小数点
                $c = strlen($num);
                $zheng = '整';
            }
            for($i=0;$i<$c;$i++) {  //处理整数部分
                $bit_num = substr($num, $i, 1); //逐字读取 左->右
                if($bit_num!=0 || substr($num, $i+1, 1)!=0) //当前是零 下一位还是零的话 就不显示
                    @$low2chinses = $low2chinses.$d[$bit_num];
                if($bit_num || $i==$c-1)
                    @$low2chinses = $low2chinses.$e[$c-$i-1];
            }
            for($j=$len_pointdigit; $j>=1; $j--) {  //处理小数部分
                $point_num = substr($num, strlen($num)-$j, 1); //逐字读取 左->右
                if($point_num != 0)
                    @$low2chinses = $low2chinses.$d[$point_num].$p[$j-1];
            //  if(substr($num, strlen($num)-2, 1)==0 && substr($num, strlen($num)-1, 1)==0) //小数点后两位都是0
            }
            $chinses = str_split($low2chinses,2); //字符串转换成数组
            //print_r($chinses);
            for($x=sizeof($chinses)-1;$x>=0;$x--) {     //过滤无效的信息
                if($inwan==0&&$chinses[$x]==$e[4]) {    //过滤重复的"万"
                    $final[$y++] = $chinses[$x];
                    $inwan=1;
                }
                if($inyi==0&&$chinses[$x]==$e[8]) {     //过滤重复的"亿"
                    $final[$y++] = $chinses[$x];
                    $inyi=1;
                    $inwan=0;
                }
                if($chinses[$x]!=$e[4]&&$chinses[$x]!=$e[8]) //进行整理,将最后的值赋予$final数组
                $final[$y++] = $chinses[$x];
            }
            $newstring=(array_reverse($final)); //$final为倒数组，$newstring为正常可以使用的数组
            $nstring=join($newstring); //数组变成字符串
            if(substr($num,-2,1)==0 && substr($num,-1)<>0) {    //判断原金额角位为0 ? 分位不为0 ?
                $nstring=substr($nstring,0,(strlen($nstring)-4))."零".substr($nstring,-4,4); //这样加一个零字
            }
            $fen="分";
            $fj=substr_count($nstring, $fen); //如果没有查到分这个字
            return $nstring=($fj==0)?$nstring.$zheng:$nstring; //就将"整"加到后面
        } 

   echo num_to_upper(1234.56);

?>

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