阶梯计费-PHP实现最简洁

最近遇到一个阶梯计费的case ，想了挺久的，还是没有很好的解决方案，今天突发奇想，被我发现了。哈哈哈哈

其实当时想了配置文件，但是没有想到这个点子上，所以记录下，下次项目中参考使用

<?php
// 阶梯计费代码
function calcMoney($n, $config) {
    $money = 0;

    foreach ($config as $k => $value) {
        if ($n >= $value['min'] && $n <= $value['max']) {
            $money += ($n - $value['min'] + 1) * $value['fee'];
            break;
        }
        $money += ($value['max'] - $value['min'] + 1) * $value['fee'];
    }

    return $money;
}
// 配置文件
$config = [
    [
        'min' => 1,
        'max' => 5,
        'fee' => 30,
    ],
    [
        'min' => 6,
        'max' => 10,
        'fee' => 25,
    ],
    [
        'min' => 11,
        'max' => 20,
        'fee' => 20,
    ],
    [
        'min' => 21,
        'max' => 50,
        'fee' => 15,
    ],
    [
        'min' => 51,
        'max' => 100,
        'fee' => 10,
    ],
    [
        'min' => 101,
        'max' => 500,
        'fee' => 9,
    ],
    [
        'min' => 501,
        'max' => 1000,
        'fee' => 8,
    ],
    [
        'min' => 1001,
        'max' => 2000,
        'fee' => 7,
    ],
    [
        'min' => 2001,
        'max' => 3000,
        'fee' => 6,
    ],
    [
        'min' => 3001,
        'max' => 4000,
        'fee' => 5,
    ],
    [
        'min' => 4001,
        'max' => 100000,//最大值正无穷表示尽可能大
        'fee' => 4,
    ],
];
$m = calcMoney(7, $config);
echo $m;

如此一个简单的函数calaMoney 即可简单的计算出费用。