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PHP一文帶你搞懂游戲中的抽獎算法

 更新時間：2022年06月15日 09:40:36   作者：PHP開源社區(qū)  
這篇文章將通過示例詳細(xì)為大家講解一下游戲中的抽獎算法，文中的示例代碼講解詳細(xì)，對我們學(xué)習(xí)PHP有一定的幫助，需要的可以參考一下

前言

沒有特別幸運，那么請先特別努力，別因為懶惰而失敗，還矯情地將原因歸于自己倒霉。你必須特別努力，才能顯得毫不費力。

希望：所以說，樹倒了，沒有一片雪花是無辜的，抽獎都是假的，只有人家想讓你中和不想讓你中，如果大家覺得文章有幫助，歡迎點贊。

一、初始化獎品

  • id 獎品的id
  • pid 獎品的自定義id
  • type 獎品類型，1、虛擬獎品 2、實物獎品 3、禮包碼 待擴(kuò)充
  • name 獎品名稱
  • total 獎品總數(shù)
  • chance 獲獎概率/抽獎基數(shù)10000
  • daynum 每日數(shù)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' => '史詩皮膚', 'total' => 40, 'chance' => 1000, 'daynum' => 10, 'pay' => 4000 ],
    ['id' => 3, 'pid' => 13, 'type' => 1, 'name' => '鉆石獎勵', 'total' => 80, 'chance' => 1000, 'daynum' => 10, 'pay' => 4000 ],
    ['id' => 4, 'pid' => 14, 'type' => 1, 'name' => '榮耀水晶', 'total' => 20, 'chance' => 1000, 'daynum' => 10, 'pay' => 8000 ]
];

 獎品詳情應(yīng)該從數(shù)據(jù)庫中讀出來

獎品詳情應(yīng)該加入緩存，避免數(shù)據(jù)庫的壓力

二、謝謝參與

<?php
$thanks_prize = [
    'id' => 0,
    'pid' => 0,
    'type' => 1,
    'name' => '謝謝參與'
];

為填充剩余概率的獎品

三、過濾抽獎、如充值條件

<?php
$pay_total = 7000;
foreach ($prize as $key => $value) {
    if($value['pay'] > $pay_total) unset($prize[$key]);
}

初步過濾一些必要因素，比如充值，角色創(chuàng)建時間等

四、重組概率

<?php
$now_chance = array_sum(array_column($prize, 'chance'));
$remain_chance = 10000 - $now_chance;
$prize[] = ['id' => 0, 'pid' => 0, 'type' => 1, 'name' => '謝謝參與', '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']];
}

初步過濾后，重構(gòu)新的抽獎信息，加入謝謝參與

第二步重組概率

五、進(jìn)行抽獎

<?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;
        }
    }
}

開始抽獎，并返回抽中的結(jié)果

六、過濾回調(diào)

<?php
//此處應(yīng)該查詢數(shù)據(jù)庫，查看該獎品已經(jīng)抽中的數(shù)量
$yet_num = 50;
if($result['pid'] != 0 && $yet_num > $result['total']) {
    $result = $thanks_prize;
}
 
//此處應(yīng)該查詢數(shù)據(jù)庫，查看該獎品今日已經(jīng)抽中的數(shù)量
$yet_today_num = 50;
if($result['pid'] != 0 && $yet_today_num > $result['daynum']) {
    $result = $thanks_prize;
}

二次過濾，獎品總數(shù)的限制以及獎品的每日限制等 

七、最終抽獎結(jié)果

<?php
//刪除敏感字段
unset($result['total'],$result['chance'],$result['daynum'],$result['pay']);
 
//返回最終抽獎結(jié)果
echo json_encode([
    'prize' => $award,
    'rand' => $rand,
    'result' => $result
]);

八、抽獎封裝成類

<?php
/**
 * Created by PhpStorm.
 * User: autofelix
 * Date: 2020/10/30
 * Time: 13:14
 * Desc: 抽獎算法
 */
 
class Lottery
{
    /**
     * 概率基數(shù)
     * @var int
     */
    private $total_chance = 10000;
 
    /**
     * 謝謝參與獎勵
     * @var array
     */
    private $thanks_prize = [
        'id' => 0,
        'pid' => 0,
        'type' => 1,
        'name' => '謝謝參與'
    ];
 
    /**
     * 獎池
     * @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' => '史詩皮膚', 'total' => 40, 'chance' => 1000, 'daynum' => 10, 'pay' => 4000 ],
        ['id' => 3, 'pid' => 13, 'type' => 1, 'name' => '鉆石獎勵', 'total' => 80, 'chance' => 1000, 'daynum' => 10, 'pay' => 4000 ],
        ['id' => 4, 'pid' => 14, 'type' => 1, 'name' => '榮耀水晶', 'total' => 20, 'chance' => 1000, 'daynum' => 10, 'pay' => 8000 ]
    ];
 
    /**
     * Lottery constructor.
     */
    public function __construct()
{
    }
 
    /**
     * @return int
     */
    private function get_user_pay()
{
        //這里應(yīng)該調(diào)用接口，返回用戶正確的充值信息
        return 3000;
    }
 
    /**
     * 重構(gòu)獎池、重組概率
     * @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]);
        }
 
        //加入謝謝惠顧
        $now_chance = array_sum(array_column($this->prize, 'chance'));
        $remain_chance = $this->total_chance - $now_chance;
        $this->prize[] = ['id' => 0, 'pid' => 0, 'type' => 1, 'name' => '謝謝參與', 'total' => 0, 'chance' => $remain_chance, 'daynum' => 0, 'pay' => 0];
 
        //重組概率
        $num = 0;
        foreach ($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;
    }
 
    /**
     * 獲取抽獎結(jié)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;
    }
 
    /**
     * 抽獎過濾回調(diào)函數(shù)
     * @param $result
     * @return array
     */
    public function filter($result)
{
        //獎品總數(shù)限制，此處應(yīng)該查數(shù)據(jù)庫
        $yet_num = 50;
        if($result['pid'] != 0 && $yet_num > $result['total']) {
            $result = $this->thanks_prize;
        }
 
        //獎品每日數(shù)量限制，此處應(yīng)該查數(shù)據(jù)庫
        $yet_today_num = 50;
        if($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());

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