PHP切割整数工具类似微信红包金额分配的思路详解
发布:smiling 来源: PHP粉丝网 添加日期:2021-12-19 11:28:36 浏览: 评论:0
这篇文章主要介绍了 PHP切割整数工具类似微信红包金额分配的思路详解,本文给大家介绍的非常详细,具有一定的参考借鉴价值,需要的朋友可以参考下。
Composer地址:https://packagist.org/packages/werbenhu/php-number-slicing
GitHub地址:https://github.com/werbenhu/php-number-slicing
主要代码:NumberSlicing.php
思路:将数字按精度放大倍数,比如切割数字1,切割的份数是10,精度是0.01,则将1放大100 X 10倍,然后再来对加了1000倍权重后的值进行切割,切割完成之后,再将权重去除,保证总值是1。
- <?php
- namespace Werben\Tools;
- use Exception;
- class NumberSlicing {
- /**
- * 精确小数点,舍弃最后一位之后的数据(非四舍五入)
- * floor with precision
- * @param $number 要精确的数
- * @param $precision 精度,比如保留到0.01,则该值为2
- * @return float|int
- */
- public static function floorWithPrecision($number, $precision) {
- $power = pow(10, $precision);
- $ret = floor($number * $power) * 1.0 / $power ;
- return $ret;
- }
- /**
- * 精确小数点,按四舍五入保留最后一位
- * round with precision
- * @param $number 要精确的数
- * @param $precision 精度,比如保留到0.01,则该值为2
- * @return float|int
- */
- public static function roundWithPrecision($number, $precision) {
- $power = pow(10, $precision);
- $ret = round($number * $power) * 1.0 / $power ;
- return $ret;
- }
- /**
- * 将数把权重放大,比如1,要按精度0.0001分配,则先将1乘以10000然后再来分配
- * random the sum weights 加上权重之后,整个要切割的数的权重总值
- * @param $weight_items 用来保留,随机分配的权重值
- * @param $count 要切割的份数
- * @param int $each_weight 加上权重之后,每一份平均的权重值
- * @param int $min_weight 加上权重之后,最小额度的值
- * @return float|int
- */
- public static function weightSlicing(&$weight_items, $count, $each_weight = 10, $min_weight = 3)
- {
- $already_count = count($weight_items);
- $cur_random_full_total = ($already_count + 1) * $each_weight;
- $already_random_real_total = 0;
- foreach ($weight_items as $value) {
- $already_random_real_total += $value;
- }
- $cur_random_rest = $cur_random_full_total - $already_random_real_total;
- if ($already_count == $count - 1) {
- $cur_random_rate = $cur_random_rest;
- } else {
- $cur_random_rate_max = $cur_random_rest + $each_weight - $min_weight * 2;
- $cur_random_rate = $min_weight + mt_rand(0, $cur_random_rate_max);
- }
- $weight_items[] = $cur_random_rate;
- return $cur_random_rate;
- }
- /**
- * slicing the number
- * @param int $number
- * @param int $size
- * @param float $precision
- * @param float $min
- * @return array
- * @throws Exception
- */
- public static function numberSlicing($number, $size, $precision = 0.01, $min = 0.01) {
- if ($number * 1.0 / $size <= $min) {
- throw new Exception('min number is bigger than the average value!');
- }
- if ($precision > 1) {
- throw new Exception('precision can\'t bigger than 1!');
- }
- if ($min < $precision) {
- throw new Exception('precision can\'t bigger than min!');
- }
- $weight_items = [];
- $items = [];
- //不加权重情况下,每一份的平均值
- $each_weight = intval($number / $size);
- if ($precision < 1) {
- //如果精度是小数
- if ($each_weight > 1) {
- //如果平均值大于1,则最小额度则直接用min就可以了
- //每一份的平均值乘以权重的值,比如精度为0.01,则每一份的平均值要乘以权重(100)
- $each_weight = intval((1 / $precision) * $number / $size);
- //最小数值也要乘以权重
- $min_weight = intval(1 / $precision) * $min;
- } else {
- //如果平均值小于1,需要将平均值也乘以权重
- $each_weight = intval(1 / $precision);
- $min_weight = $each_weight * $size * $min / $number;
- }
- $precision_num = log10(1 / $precision);
- } else {
- //如果精度是整数(1)
- $min_weight = $min;
- $precision_num = 0;
- }
- $sum_item_number = 0.0;
- $sum_weight = 0.0;
- //先将整个数,随机按最小额度分配
- for ($i = 0; $i < $size; $i++) {
- $cur_weight = self::weightSlicing($weight_items, $size, $each_weight, $min_weight);
- //将权重去除,换算回原先的比例
- $rate = ($number * $cur_weight * 1.00) / ($size * $each_weight);
- $rate = self::floorWithPrecision($rate, $precision_num);
- $sum_item_number += $rate;
- $sum_weight += $cur_weight;
- $items[] = $rate;
- }
- //由于误差,随机分配后,还会遗留一些数没有完全分配完,则将剩下的数随机分配
- if ($precision_num != 0) {
- //如果是切割成小数
- $rest = $number - $sum_item_number;
- while ($rest - 0.00 > PHP_FLOAT_MIN) {
- if ($rest / $min >= 1.0) {
- //剩余的数大于min最小额度,则将每份最小额度随机分配
- $random_index = mt_rand(0, $size - 1);
- $items[$random_index] = self::roundWithPrecision($items[$random_index] + $min, $precision_num);
- $sum_item_number = self::roundWithPrecision($sum_item_number + $min, $precision_num);
- $rest = self::roundWithPrecision($number - $sum_item_number, $precision_num);
- } else {
- //剩余的数小于min最小额度,则将这最后的未分配的数随机分配
- $random_index = mt_rand(0, $size - 1);
- $items[$random_index] = self::roundWithPrecision($items[$random_index] + $number - $sum_item_number, $precision_num);
- $sum_item_number = $number;
- $rest = $number - $sum_item_number;
- }
- }
- } else {
- //如果是切割成整数
- $rest = $number - $sum_item_number;
- while ($rest > 0) {
- if ($rest / $min >= 1) {
- $random_index = mt_rand(0, $size - 1);
- $items[$random_index] += $min;
- $sum_item_number += $min;
- $rest = $number - $sum_item_number;
- } else {
- $random_index = mt_rand(0, $size - 1);
- $items[$random_index] += $rest;
- $sum_item_number += $rest;
- $rest = $number - $sum_item_number;
- }
- }
- }
- return $items;
- }
- }
测试代码:
- use Werben\Tools\NumberSlicing;
- function testIntSlicing2IntOne() {
- $precision = 1; //精确度 eg: 1, 0.1, 0.01, 0.01
- $size = 10; //切割的份数,the size of the number to slicing
- $min = 3; //最小额度,最小额度必须大于最小精度,min amount eg: 3, 0.23, 0.05, 0.008
- $number = 100; //要切割的数字,the number
- $items = NumberSlicing::numberSlicing($number, $size, $precision, $min);
- $sum = 0.0;
- $ret_min = $number;
- foreach ($items as $value) {
- $sum += $value;
- if ($ret_min > $value) {
- $ret_min = $value;
- }
- }
- $count = count($items);
- echo "count: $count, sum: $sum, ret_min: $ret_min\n";
- echo "items : ". json_encode($items) ."\n";
- }
- function testIntSlicing2IntTwo() {
- $precision = 1; //精确度 eg: 1, 0.1, 0.01, 0.01
- $size = 30; //切割的份数,the size of the number to slicing
- $min = 18666; //最小额度,最小额度必须大于最小精度,min amount eg: 3, 0.23, 0.05, 0.008
- $number = 800000; //要切割的数字,the number
- $items = NumberSlicing::numberSlicing($number, $size, $precision, $min);
- $sum = 0.0;
- $ret_min = $number;
- foreach ($items as $value) {
- $sum += $value;
- if ($ret_min > $value) {
- $ret_min = $value;
- }
- }
- $count = count($items);
- echo "count: $count, sum: $sum, ret_min: $ret_min\n";
- echo "items : ". json_encode($items) ."\n";
- }
- function testIntSlicing2FloatOne() {
- $precision = 0.01; //精确度 eg: 1, 0.1, 0.01, 0.01
- $size = 1000; //切割的份数,the size of the number to slicing
- $min = 0.05; //最小额度,最小额度必须大于最小精度,min amount eg: 3, 0.23, 0.05, 0.008
- $number = 100; //要切割的数字,the number
- $items = NumberSlicing::numberSlicing($number, $size, $precision, $min);
- $sum = 0.0;
- $ret_min = $number;
- foreach ($items as $key => $value) {
- $sum += $value;
- if ($ret_min > $value) {
- $ret_min = $value;
- }
- }
- $count = count($items);
- echo "count: $count, sum: $sum, ret_min: $ret_min\n";
- echo "items: ". json_encode($items) ."\n";
- }
- function testIntSlicing2FloatTwo() {
- $precision = 0.00001; //精确度 eg: 1, 0.1, 0.01, 0.01
- $size = 1000; //切割的份数,the size of the number to slicing
- $min = 0.00005; //最小额度,最小额度必须大于最小精度,min amount eg: 3, 0.23, 0.05, 0.008
- $number = 5; //要切割的数字,the number
- $items = NumberSlicing::numberSlicing($number, $size, $precision, $min);
- $sum = 0.0;
- $ret_min = $number;
- foreach ($items as $key => $value) {
- $sum += $value;
- if ($ret_min > $value) {
- $ret_min = $value;
- }
- }
- $count = count($items);
- echo "count: $count, sum: $sum, ret_min: $ret_min\n";
- echo "items: ". json_encode($items) ."\n";
- }
Tags: PHP切割整数 PHP微信红包金额
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