Question

想象一下，我们有一个像下面的样本数组一样的数组，我们希望从中得到随机奖。

但是，我们希望获得每个奖项的胜利控制机会，这意味着我们希望控制哪一个奖品获胜的机会更高或更低。

<?php 

$prizes = [
    ["title" => "1st Prize", "chance" => "10"],
    ["title" => "2nd Prize", "chance" => "15"],
    ["title" => "3rd Prize", "chance" => "50"],
    ["title" => "4th Prize", "chance" => "35"],
    ["title" => "5th Prize", "chance" => "75"],
    ["title" => "6th Prize", "chance" => "35"],
    ["title" => "7th Prize", "chance" => "55"],
    ["title" => "8th Prize", "chance" => "99"],
    ["title" => "9th Prize", "chance" => "11"],
];

?>

Answer 1

首先，这些机会加起来超过100％。是否有可能一次赢得多个奖项？

我这样做的方法就是选择1到100之间的随机数，例如

$rng = rand(1,100);。然后将结果与数组的所有chance字段进行比较。如果随机数等于或小于特定奖品的chance，则该用户赢得该奖品。

Answer 2

其中一个做法是总结所有机会，然后随机化一个大数字的数字，看看它在哪里＆＃34;点击＆＃34;：

// Sum the chances
$totalChances = 0;
foreach ($prizes as $prize) {
    $totalChances += $prize['chance'];
}

// Randomize a number:
$rand = rand(0, $totalChances);

// Pick a prize
$currPize = '';
$currChance = 0;
$i = 0;
do {
    $currChance += $prizes[i]['chance'];
    $i++;
} while ($currChance < $prizes[i]['chance']);

如何控制从阵列中获奖的机会

2 个答案: