抽奖的算法也是比较简单分享两种的吧

1、只要是随机的数在当前的范围内就是中奖，设置奖品不是10000的话不会中奖，自己使用的抽奖代码逻辑

// 从1-10000中随机抽取一个数
$randomProbability  = random_int(1, 10000);
$currentProbability = 0;
// $award 抽中的奖品信息
$award = [];
foreach ($realPrizes as $realPrize) {
    $currentProbability += $realPrize['probability'];
    if ($randomProbability <= $currentProbability) {
        $award = $realPrize;
        break;
    }
}

2、百度比较多的，所有奖品中奖概率是总概率

<?php
public function gl(){
    $prize_arr = [
        '0' => ['id' => 1, 'prize' => '奖品1', 'v' => 20],
        '1' => ['id' => 2, 'prize' => '奖品2', 'v' => 10],
        '2' => ['id' => 3, 'prize' => '奖品3', 'v' => 20],
        '3' => ['id' => 4, 'prize' => '奖品4', 'v' => 5],
        '4' => ['id' => 5, 'prize' => '奖品5', 'v' => 19],
        '5' => ['id' => 6, 'prize' => '奖品6', 'v' => 5],
        '6' => ['id' => 7, 'prize' => '奖品7', 'v' => 10],
        '7' => ['id' => 8, 'prize' => '奖品8', 'v' => 10],
    ];

    foreach ($prize_arr as $key => $val) {
        $arr[$val['id']] = $val['v'];
    }

    $rid = $this->get_prize($arr); //根据概率获取奖项id
    $data = $prize_arr[$rid-1];
    return json($data);

}

public function get_prize($proArr) {
    $result = '';
    //概率数组的总概率精度
    $proSum = array_sum($proArr);
    //概率数组循环
    foreach ($proArr as $key => $proCur) {
        $randNum = mt_rand(1, $proSum);
        if ($randNum <= $proCur) {
            $result = $key;
            break;
        } else {
            $proSum -= $proCur;
        }
    }
    unset ($proArr);
    return $result;
}
?>

简单的抽奖算法的分享，后面有其他的也会分享一下