目录
前言
没有特别幸运，那么请先特别努力，别因为懒惰而失败，还矫情地将原因归于自己倒霉。你必须特别努力，才能显得毫不费力。
希望：所以说，树倒了，没有一片雪花是无辜的，抽奖都是假的，只有人家想让你中和不想让你中，如果大家觉得文章有帮助，欢迎点赞。
一、初始化奖品
- id 奖品的id
- pid 奖品的自定义id
- type 奖品类型，1、虚拟奖品 2、实物奖品 3、礼包码 待扩充
- name 奖品名称
- total 奖品总数
- chance 获奖概率/抽奖基数10000
- daynum 每日数量限制
- pay 充值限制
<?php
$prize = [
[\'id\' => 1, \'pid\' => 11, \'type\' => 1, \'name\' => \'典藏英雄\', \'total\' => 20, \'chance\' => 1000, \'daynum\' => 10, \'pay\' => 2000 ],
[\'id\' => 2, \'pid\' => 12, \'type\' => 1, \'name\' => \'史诗皮肤\', \'total\' => 40, \'chance\' => 1000, \'daynum\' => 10, \'pay\' => 4000 ],
[\'id\' => 3, \'pid\' => 13, \'type\' => 1, \'name\' => \'钻石奖励\', \'total\' => 80, \'chance\' => 1000, \'daynum\' => 10, \'pay\' => 4000 ],
[\'id\' => 4, \'pid\' => 14, \'type\' => 1, \'name\' => \'荣耀水晶\', \'total\' => 20, \'chance\' => 1000, \'daynum\' => 10, \'pay\' => 8000 ]
];
奖品详情应该从数据库中读出来
奖品详情应该加入缓存，避免数据库的压力
二、谢谢参与
<?php
$thanks_prize = [
\'id\' => 0,
\'pid\' => 0,
\'type\' => 1,
\'name\' => \'谢谢参与\'
];
为填充剩余概率的奖品
三、过滤抽奖、如充值条件
<?php
$pay_total = 7000;
foreach ($prize as $key => $value) {
if($value[\'pay\'] > $pay_total) unset($prize[$key]);
}
初步过滤一些必要因素，比如充值，角色创建时间等
四、重组概率
<?php
$now_chance = array_sum(array_column($prize, \'chance\'));
$remain_chance = 10000 - $now_chance;
$prize[] = [\'id\' => 0, \'pid\' => 0, \'type\' => 1, \'name\' => \'谢谢参与\', \'total\' => 0, \'chance\' => $remain_chance, \'daynum\' => 0, \'pay\' => 0];
$award = [];
$num = 0;
foreach ($prize as $_v) {
$num += $_v[\'chance\'];
$award[] = [\'id\' => $_v[\'id\'], \'pid\' => $_v[\'pid\'], \'type\' => $_v[\'type\'], \'name\' => $_v[\'name\'], \'total\' => $_v[\'total\'], \'chance\' => $num, \'daynum\' => $_v[\'daynum\'], \'pay\' => $_v[\'pay\']];
}
初步过滤后，重构新的抽奖信息，加入谢谢参与
第二步重组概率
五、进行抽奖
<?php
$rand = mt_rand(1, 10000);
$result = [];
foreach ($award as $_k => $_v) {
if ($_k == 0) {
if ($rand > 0 && $rand <= $_v[\'chance\']) {
$result = $_v;
break;
}
} else {
if ($rand > $award[$_k - 1][\'chance\'] && $rand <= $_v[\'chance\']) {
$result = $_v;
break;
}
}
}
开始抽奖，并返回抽中的结果
六、过滤回调
<?php
//此处应该查询数据库，查看该奖品已经抽中的数量
$yet_num = 50;
if($result[\'pid\'] != 0 && $yet_num > $result[\'total\']) {
$result = $thanks_prize;
}
//此处应该查询数据库，查看该奖品今日已经抽中的数量
$yet_today_num = 50;
if($result[\'pid\'] != 0 && $yet_today_num > $result[\'daynum\']) {
$result = $thanks_prize;
}
二次过滤，奖品总数的限制以及奖品的每日限制等
七、最终抽奖结果
<?php
//删除敏感字段
unset($result[\'total\'],$result[\'chance\'],$result[\'daynum\'],$result[\'pay\']);
//返回最终抽奖结果
echo json_encode([
\'prize\' => $award,
\'rand\' => $rand,
\'result\' => $result
]);
八、抽奖封装成类
<?php
/**
* Created by PhpStorm.
* User: autofelix
* Date: 2020/10/30
* Time: 13:14
* Desc: 抽奖算法
*/
class Lottery
{
/**
* 概率基数
* @var int
*/
private $total_chance = 10000;
/**
* 谢谢参与奖励
* @var array
*/
private $thanks_prize = [
\'id\' => 0,
\'pid\' => 0,
\'type\' => 1,
\'name\' => \'谢谢参与\'
];
/**
* 奖池
* @var array
*/
private $prize = [
[\'id\' => 1, \'pid\' => 11, \'type\' => 1, \'name\' => \'典藏英雄\', \'total\' => 20, \'chance\' => 1000, \'daynum\' => 10, \'pay\' => 2000 ],
[\'id\' => 2, \'pid\' => 12, \'type\' => 1, \'name\' => \'史诗皮肤\', \'total\' => 40, \'chance\' => 1000, \'daynum\' => 10, \'pay\' => 4000 ],
[\'id\' => 3, \'pid\' => 13, \'type\' => 1, \'name\' => \'钻石奖励\', \'total\' => 80, \'chance\' => 1000, \'daynum\' => 10, \'pay\' => 4000 ],
[\'id\' => 4, \'pid\' => 14, \'type\' => 1, \'name\' => \'荣耀水晶\', \'total\' => 20, \'chance\' => 1000, \'daynum\' => 10, \'pay\' => 8000 ]
];
/**
* Lottery constructor.
*/
public function __construct()
{
}
/**
* @return int
*/
private function get_user_pay()
{
//这里应该调用接口，返回用户正确的充值信息
return 3000;
}
/**
* 重构奖池、重组概率
* @return array
*/
private function init_lottery_pond()
{
$award = [];
//充值限制
$user_pay = $this->get_user_pay();
foreach ($this->prize as $key => $value) {
if($value[\'pay\'] <= $user_pay) unset($this->prize[$key]);
}
//加入谢谢惠顾
$now_chance = array_sum(array_column($this->prize, \'chance\'));
$remain_chance = $this->total_chance - $now_chance;
$this->prize[] = [\'id\' => 0, \'pid\' => 0, \'type\' => 1, \'name\' => \'谢谢参与\', \'total\' => 0, \'chance\' => $remain_chance, \'daynum\' => 0, \'pay\' => 0];
//重组概率
$num = 0;
foreach ($this->prize as $_v) {
$num += $_v[\'chance\'];
$award[] = [\'id\' => $_v[\'id\'], \'pid\' => $_v[\'pid\'], \'type\' => $_v[\'type\'], \'name\' => $_v[\'name\'], \'total\' => $_v[\'total\'], \'chance\' => $num, \'daynum\' => $_v[\'daynum\'], \'pay\' => $_v[\'pay\']];
}
return $award;
}
/**
* 获取抽奖结果
* @return array
*/
public function get_prize()
{
$award = $this->init_lottery_pond();
$rand = mt_rand(1, $this->total_chance);
$result = [];
foreach ($award as $_k => $_v) {
if ($_k == 0) {
if ($rand > 0 && $rand <= $_v[\'chance\']) {
$result = $_v;
break;
}
} else {
if ($rand > $award[$_k - 1][\'chance\'] && $rand <= $_v[\'chance\']) {
$result = $_v;
break;
}
}
}
$result = $this->filter($result);
return $result;
}
/**
* 抽奖过滤回调函数
* @param $result
* @return array
*/
public function filter($result)
{
//奖品总数限制，此处应该查数据库
$yet_num = 50;
if($result[\'pid\'] != 0 && $yet_num > $result[\'total\']) {
$result = $this->thanks_prize;
}
//奖品每日数量限制，此处应该查数据库
$yet_today_num = 50;
if($result[\'pid\'] != 0 && $yet_today_num > $result[\'daynum\']) {
$result = $this->thanks_prize;
}
//不暴露敏感信息
unset($result[\'total\'], $result[\'chance\'], $result[\'daynum\'], $result[\'pay\'] );
return $result;
}
private function __clone()
{
}
}
echo json_encode((new Lottery())->get_prize());
以上就是PHP一文带你搞懂游戏中的抽奖算法的详细内容，更多关于PHP抽奖算法的资料请关注其它相关文章！
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