投票网站源码php

<?php
// 开启事务
$db->beginTransaction();

try {
    // 更新投票数
    $db->query("UPDATE votes SET count = count + 1 WHERE option_id = :option_id", [':option_id' => $optionId]);

    // 提交事务
    $db->commit();
} catch (Exception $e) {
    // 回滚事务
    $db->rollBack();
    throw $e;
}
?>

<?php
// 验证用户输入
if (!filter_var($optionId, FILTER_VALIDATE_INT)) {
    throw new Exception("Invalid option ID");
}

// 更新投票数
$db->query("UPDATE votes SET count = count + 1 WHERE option_id = :option_id", [':option_id' => $optionId]);
?>

<?php
// 使用缓存
$cacheKey = "vote_count_" . $optionId;
$voteCount = $cache->get($cacheKey);

if ($voteCount === false) {
    $voteCount = $db->query("SELECT count FROM votes WHERE option_id = :option_id", [':option_id' => $optionId])->fetchColumn();
    $cache->set($cacheKey, $voteCount, 3600); // 缓存1小时
}

echo "Vote count: " . $voteCount;
?>