大写数字转阿拉伯

php

<?php
header("Content-type:text/html;charset=utf-8");
/**
 * 把汉字转化为数组. ex: '一二三' -> ['一','二','三']
 * @param $str
 * @return array
 */
function str2array($str)
{
    $encode = mb_detect_encoding($str);
    $len = mb_strlen($str, $encode);
    $arr = array();
    for ($i = 0; $i < $len; $i++) {
        $arr[] = mb_substr($str, $i, 1, $encode);
    }
    return $arr;
}
/**
 * 把 大写数字 转化为 阿拉伯字符串 '壹百' -> '100'
 * @param $arr 标准的大写数字
 * @param int $str_num_len 结果的最大可能长度
 * @return string
 */
function toNum($arr, $str_num_len = 13)
{
    $map = array(
        '零' => 0,
        '壹' => 1,
        '贰' => 2,
        '叁' => 3,
        '肆' => 4,
        '伍' => 5,
        '陆' => 6,
        '柒' => 7,
        '捌' => 8,
        '玖' => 9
    );
    $map2 = array('零', '壹', '贰', '叁', '肆', '伍', '陆', '柒', '捌', '玖');
    $local = array(
        '拾' => 2,
        '佰' => 3,
        '仟' => 4
    );
    $local2 = array('拾', '佰', '仟');
    $len = count($arr);
    // $arr 待处理的数组
    // $len 数组长度
    $str_num = '';
    // 保存结果
    // $str_num_len 结果的最大可能长度
    $str_num = str_pad($str_num, $str_num_len, '0');
    $j = $str_num_len - 1; // 当前指向 $str_num 的位置
    $k = $str_num_len; // 指向 '个'
    // 当前大位置,(个,万,亿). 从右往左遍历,$k(依次)指向 (个,万,亿) 目前最大的位置
    for ($i = $len - 1; $i >= 0; $i--) {
        if (in_array($arr[$i], $local2)) {// '拾', '佰', '仟'
            $j = $k - $local[$arr[$i]];
        } elseif (in_array($arr[$i], $map2)) {// '零', '壹', '贰', '叁', '肆', '伍', '陆', '柒', '捌', '玖'
            $str_num[$j] = $map[$arr[$i]];
            $j--;
        } elseif ($arr[$i] === '万') { // '万'
            $k = $str_num_len - 4;
            $j = $k - 1;
        } elseif ($arr[$i] === '亿') { // '亿'
            $k = $str_num_len - 8;
            $j = $k - 1;
        }
    }
    for ($a = 0; $a < $str_num_len; $a++) {
        if ($str_num[$a] !== '0') {
            $str_num = substr($str_num, $a);
            break;
        }
    }
    return $str_num;
}
//$str_number = "贰仟零伍亿叁佰捌拾万零叁拾";
//$str_number = "壹佰叁拾壹亿壹仟叁佰壹拾万零陆佰伍拾叁元整";
//$str_number = "壹拾亿零贰仟叁佰捌拾壹万叁仟陆佰肆拾伍元整";
//$str_number = "贰佰零壹亿肆仟贰佰零壹万肆仟贰佰零壹元整";
//$str_number = "壹";
//$str_number = "壹亿";
$str_number = "壹亿壹仟万零壹拾";
$arr_number = str2array($str_number);
$a = toNum($arr_number);
var_dump($a);