<?php
 namespace TechOnline\Utils; class LotteryUtil { public static function fetchPoll(array $pool) { $map = []; $index = 0; foreach ($pool as $item) { $space = intval(bcmul($item['rate'], 100, 2)); if ($space <= 0) { continue; } for ($i = 0; $i < $space; $i++) { $map[$index++] = $item['id']; } if ($index > 10000) { throw new \Exception('bad lottery pool 10000'); } } while ($index < 10000) { $map[$index++] = null; } $index = rand(0, 9999); return $map[$index]; } public static function randomMoneyInRange($min, $max) { $redbagValue = rand( intval(bcmul($min, 100, 2)), intval(bcmul($max, 100, 2)) ); return bcdiv($redbagValue, 100, 2); } private static function generate($code, $msg, $data = null) { $response = [ 'code' => $code, 'msg' => $msg, 'data' => $data, ]; if (null === $data) { unset($response['data']); } return $response; } public static function money($moneyTotal, $number, $moneyPerMin, $moneyPerMax) { $min = intval(bcmul($moneyPerMin, 100, 2)); $max = intval(bcmul($moneyPerMax, 100, 2)); $total = intval(bcmul($moneyTotal, 100, 2)); $number = intval($number); if ($total < $min * $number) { return self::generate(-1, '金额最少为' . sprintf('%0.2f', bcdiv($min * $number, 100, 2))); } if ($total > $max * $number) { return self::generate(-1, '金额最多为' . sprintf('%0.2f', bcdiv($max * $number, 100, 2))); } if ($number < 1 || $number > 100000) { return self::generate(-1, '数量范围为 1-100000'); } if ($total < 1 || $total > 1000000 * 100) { return self::generate(-1, '金额范围为 0.01-1000000.00'); } $leftTotal = $total - $min * $number; $moneys = []; for ($i = 0, $diff = $max - $min; $i < $number; $i++) { if ($leftTotal > 0) { $moneyRandom = rand(0, $diff); if ($moneyRandom > $leftTotal) { $moneyRandom = $leftTotal; } $leftTotal -= $moneyRandom; } else { $moneyRandom = 0; } $moneys[] = $min + $moneyRandom; } if ($leftTotal > 0) { foreach ($moneys as &$money) { $diff = $max - $money; if (!$diff) { continue; } if ($diff <= $leftTotal) { $money += $diff; $leftTotal -= $diff; } else { $money += $leftTotal; $leftTotal = 0; break; } } } $total = bcdiv(array_sum($moneys), 100, 2); foreach ($moneys as &$money) { $money = bcdiv($money, 100, 2); } shuffle($moneys); return self::generate(0, null, [ 'total' => $total, 'min' => bcdiv($min, 100, 2), 'max' => bcdiv($max, 100, 2), 'number' => $number, 'moneys' => $moneys, ]); } public static function next($moneyTotal, $number, $moneyPerMin = null, $moneyPerMax = null) { if (null === $moneyPerMin) { $total = bcmul($moneyTotal, 100, 2); $moneyPerMin = max(intval($total / $number / 2), 1); $moneyPerMin = bcdiv($moneyPerMin, 100, 2); } if (null === $moneyPerMax) { $total = bcmul($moneyTotal, 100, 2); $moneyPerMax = max(intval($total / $number * 2), 1); $moneyPerMax = bcdiv($moneyPerMax, 100, 2); } $ret = self::money($moneyTotal, $number, $moneyPerMin, $moneyPerMax); if ($ret['code']) { return self::generate(-1, $ret['msg']); } return self::generate(0, null, ['money' => $ret['data']['moneys'][0]]); } public static function lottery(array $pool) { $map = []; $index = 0; foreach ($pool as $item) { for ($i = 0; $i < $item['rate']; $i++) { $map[$index++] = $item['id']; } if ($index > 100) { throw new \Exception('bad lottery pool'); } } while ($index < 100) { $map[$index++] = null; } $index = rand(0, 99); return $map[$index]; } public static function preciseLottery(array $pool) { $map = []; $index = 0; foreach ($pool as $item) { $space = intval(bcmul($item['rate'], 100, 2)); for ($i = 0; $i < $space; $i++) { $map[$index++] = $item['id']; } if ($index > 10000) { throw new \Exception('bad lottery pool 10000'); } } while ($index < 10000) { $map[$index++] = null; } $index = rand(0, 9999); return $map[$index]; } public static function probability($percent) { return rand(0, 99) < $percent; } }