How to convert Chinese characters to Arabic numerals in php

php Method to convert Chinese characters to Arabic numbers: 1. Create a PHP sample file; 2. Initialize an array; 3. Split the string into units; 4. Convert the grouped strings into numbers and Just multiply by the unit.

The operating environment of this article: Windows 7 system, PHP version 7.1, DELL G3 computer

php How to convert Chinese characters to Arabic numerals?

php Chinese to Arabic numerals

Interview question, I wrote one that was full of loopholes and was despised by others, so I came back and spent the whole morning writing one, I tested it myself and it seems to be OK.

Thoughts

Such as Chinese numbers

Seven hundred and seventy-eight trillion, forty-seven trillion, seventy-five million, seven hundred and four One Thousand Four Hundred and Eighty-Six

If the red text is regarded as units, then after dividing it by these units, the other parts will be a number of ten hundred thousand. Multiply these numbers by their units and sum them up to get the result.

Code

function ch2num($str){
    //单位数组用于循环遍历，单位顺序从大到小
    $c = [
        '万亿'=>1000000000000,
        '亿' => 100000000,
        '万' => 10000,
    ];
    //中文替换数字规则，零没什么卵用；所以去掉
    $b = [
        '一' =>1,
        '二' =>2,    
        '三' =>3,
        '四' =>4,
        '五' =>5,
        '六' =>6,
        '七' =>7,
        '八' =>8,
        '九' =>9,
        '零' =>'',
    ];
    //替换数字
    $str =  str_replace(array_keys($b), array_values($b), $str);
    //结果 7百7十8万亿4千7百2十亿7千5百7十万4千4百8十
　　//如果字符串以十开头，前边加1
    if(mb_strpos($str, '十' ,0 ,'utf-8') === 0)
        $str = '1'.$str;
    　　
    //初始化一个数组
    $arr[] = array(
        'str'    => $str, //字符串
        'unit'  => 1,     //单位
    );
    //将字符串按单位切分
    foreach ($c as $key => $value) {
        $brr = [];
        foreach ($arr as $item) {
            if(strpos($item['str'], $key)){
                $sun = explode($key, $item['str'],2);
                $brr[] = [
                    'str' => $sun[0],
                    'unit' => $value,
                ];
                $brr[] = [
                    'str' => $sun[1],
                    'unit' => $item['unit'],
                ];
            }else{
                $brr[] = $item;
            }
        }
        $arr = $brr;
    }
    /*    结果
        (
        [0] => Array
            (
                [str] => 7百7十8
                [unit] => 1000000000000
            )
        [1] => Array
            (
                [str] => 4千7百2十
                [unit] => 100000000
            )
        [2] => Array
            (
                [str] => 7千5百7十
                [unit] => 10000
            )
        [3] => Array
            (
                [str] => 4千4百8十6
                [unit] => 1
            )
        )*/
    //遍历求和
    $sum = 0;
    foreach ($arr as $item) {
        $sum += getNum($item['str'],$item['unit']);
    }
    return $sum;
}
//将分组后的字符串转化成数字，并乘以单位
function getNum($str,$st){
    //倍数
    $a = [
        '千'=>1000,
        '百'=>100,
        '十'=>10
    ];
    //开始值
    $num = 0;
    //当前值所在位数
    $step = 1;
    //单位
    $un = 1;
    $arr =  preg_split(&#39;/(?<!^)(?!$)/u&#39;, $str);
    while (count($arr)) {
        $m = array_pop($arr);
        //如果是位数;更新倍数
        if(!empty($a[$m])){
            $step = $a[$m];
        }
        if(is_numeric($m)){
            $num += $m * $step;
        }
    }
    return $num * $st;
}

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