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php实现抽签

2026-01-28 21:52:40PHP

PHP实现抽签功能

基础随机抽签

使用PHP内置的rand()或mt_rand()函数实现简单抽签：

$participants = ['张三', '李四', '王五', '赵六'];
$winner = $participants[mt_rand(0, count($participants) - 1)];
echo "中签者: ".$winner;

加权抽签系统

为不同参与者设置不同的中签概率：

php实现抽签

$weightedList = [
    ['name' => '张三', 'weight' => 10],
    ['name' => '李四', 'weight' => 30],
    ['name' => '王五', 'weight' => 60]
];

$totalWeight = array_sum(array_column($weightedList, 'weight'));
$random = mt_rand(1, $totalWeight);
$currentWeight = 0;

foreach ($weightedList as $item) {
    $currentWeight += $item['weight'];
    if ($random <= $currentWeight) {
        echo "中签者: ".$item['name'];
        break;
    }
}

数据库抽签实现

从MySQL数据库随机选取记录：

php实现抽签

$pdo = new PDO('mysql:host=localhost;dbname=lottery', 'username', 'password');
$stmt = $pdo->query("SELECT name FROM participants ORDER BY RAND() LIMIT 1");
$winner = $stmt->fetchColumn();
echo "中签者: ".$winner;

防止重复中签

使用会话或数据库记录已中签人员：

session_start();
if (!isset($_SESSION['winners'])) {
    $_SESSION['winners'] = [];
}

$available = array_diff($participants, $_SESSION['winners']);
if (!empty($available)) {
    $winner = $available[array_rand($available)];
    $_SESSION['winners'][] = $winner;
    echo "中签者: ".$winner;
} else {
    echo "所有人员已抽签完毕";
}

可视化抽签界面

结合HTML/CSS创建动态效果：

// 前端部分
echo '<div id="lottery-container">';
foreach ($participants as $p) {
    echo '<div class="lottery-item">'.$p.'</div>';
}
echo '</div>';

// 后端处理
if ($_SERVER['REQUEST_METHOD'] === 'POST') {
    header('Content-Type: application/json');
    $winner = $participants[array_rand($participants)];
    echo json_encode(['winner' => $winner]);
    exit;
}