php怎么把数字转为汉字

/**

    * 把数字1-1亿换成汉字表述，如：123->一百二十三

    * @param [num] $num [数字]

    * @return [string] [string]

    */

    function numToWord($num)

    {

        $chiNum = array('零', '一', '二', '三', '四', '五', '六', '七', '八', '九');

        $chiUni = array('','十', '百', '千', '万', '亿', '十', '百', '千');

  

        $chiStr = '';

  

        $num_str = (string)$num;

  

        $count = strlen($num_str);

        $last_flag = true; //上一个 是否为0

        $zero_flag = true; //是否第一个

        $temp_num = null; //临时数字

  

        $chiStr = '';//拼接结果

        if ($count == 2) {//两位数

            $temp_num = $num_str[0];

            $chiStr = $temp_num == 1 ? $chiUni[1] : $chiNum[$temp_num].$chiUni[1];

            $temp_num = $num_str[1];

            $chiStr .= $temp_num == 0 ? '' : $chiNum[$temp_num];

        }else if($count > 2){

            $index = 0;

            for ($i=$count-1; $i >= 0 ; $i--) {

                $temp_num = $num_str[$i];

                if ($temp_num == 0) {

                    if (!$zero_flag && !$last_flag ) {

                        $chiStr = $chiNum[$temp_num]. $chiStr;

                        $last_flag = true;

                    }

                }else{

                    $chiStr = $chiNum[$temp_num].$chiUni[$index%9] .$chiStr;

                    $zero_flag = false;

                    $last_flag = false;

                }

                $index ++;

            }

        }else{

            $chiStr = $chiNum[$num_str[0]];

        }

        return $chiStr;

    }