抽奖算法 php

<?php
// 参与者列表
$participants = [
    'Alice',
    'Bob',
    'Charlie',
    'David',
    'Eve'
];

// 随机选择一个获胜者
$winner = $participants[array_rand($participants)];

echo "The winner is: " . $winner;
?>

<?php
// 参与者及其权重
$participants = [
    'Alice' => 1,
    'Bob' => 2,
    'Charlie' => 3,
    'David' => 4,
    'Eve' => 5
];

// 计算总权重
$totalWeight = array_sum($participants);

// 生成一个随机数
$randomNumber = mt_rand(1, $totalWeight);

// 根据权重选择获胜者
$winner = null;
$accumulatedWeight = 0;
foreach ($participants as $name => $weight) {
    $accumulatedWeight += $weight;
    if ($randomNumber <= $accumulatedWeight) {
        $winner = $name;
        break;
    }
}

echo "The winner is: " . $winner;
?>