Example analysis of PHP's big turntable probability algorithm

With the vigorous development of e-commerce and marketing activities, there are more and more discounts and gift activities, among which the big carousel is a very popular way of gifting. However, if everyone does not conduct a detailed probability algorithm, it may lead to an imbalance in the probability of prizes, and even loopholes may be exploited by players. As for the probability algorithm of the PHP big turntable, we need to study it in depth.

First, let’s take a look at the composition of the big turntable. Usually, the big wheel can be divided into the following parts: pointers, prizes, and wheel background. The function of the pointer is to indicate the prizes drawn by the players. The prizes are usually divided into different levels and different quantities. The background of the turntable is to create a game atmosphere.

In php, we can build the configuration of the big carousel through an array. Usually, we need to set the number of different prizes and the probabilities of different prizes. Here, we need to pay attention to the setting of probability, because the imbalance of probability will affect the player's experience and game fairness. We can set the prize and probability through the following code example:

// 奖品列表
$goods_list = array(
    array('id'=>1,'name'=>'特等奖','num'=>1,'rate'=>0.01),
    array('id'=>2,'name'=>'一等奖','num'=>10,'rate'=>0.1),
    array('id'=>3,'name'=>'二等奖','num'=>20,'rate'=>0.2),
    array('id'=>4,'name'=>'三等奖','num'=>50,'rate'=>0.49),
    array('id'=>5,'name'=>'感谢参与','num'=>1000,'rate'=>0.2),
);

// 计算总概率
$total_rate = 0;
foreach ($goods_list as $goods) {
    $total_rate += $goods['rate'];
}

// 随机概率
$rand_rate = mt_rand() / mt_getrandmax() * $total_rate;

// 计算中奖的奖品
$win_goods = null;
foreach ($goods_list as $goods) {
    if ($rand_rate <= $goods['rate']) {
        $win_goods = $goods;
        break;
    }
    $rand_rate -= $goods['rate'];
}

// 如果有中奖奖品，减少奖品数量
if ($win_goods) {
    $win_goods['num']--;
}

In the above code, we calculate the probability of each prize and then calculate the final winning result through random numbers. At the same time, when a player wins the prize, we also need to reduce the number of prizes in a timely manner to avoid the same prize being drawn multiple times.

Of course, in the actual development process, we also need to consider the following aspects:

1. The number and probability of prizes should be set reasonably to avoid players taking advantage of loopholes.
2. When there are multiple big carousel activities at the same time, it is necessary to distinguish the activity IDs to avoid confusion of prizes.
3. The reduction of prizes should be handled in the transaction to avoid problems such as inaccurate prize quantities caused by multiple players snapping up the same prize at the same time.

To sum up, the probability algorithm of PHP Roulette requires us to think carefully and make reasonable settings, so as to ensure game fairness and player experience. At the same time, during the development process, we also need to pay attention to the robustness and efficiency of the code to avoid unnecessary errors and performance bottlenecks.

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