队列的作用和在PHP与MySQL中的应用场景

<?php

// 异步发送邮件任务的函数
function sendMail($to, $subject, $content) {
    // 发送邮件的相关逻辑...
    echo "Sending email to: {$to} - Subject: {$subject} - Content: {$content}
";
    sleep(1); // 模拟邮件发送的耗时
}

// 将邮件发送任务放入队列
function queueMail($to, $subject, $content) {
    $data = [
        'to' => $to,
        'subject' => $subject,
        'content' => $content
    ];
    $queue = new RedisQueue(); // 假设使用Redis作为队列存储
    $queue->push(json_encode($data));
}

// 从队列中取出邮件发送任务并执行
function processMailQueue() {
    $queue = new RedisQueue(); // 假设使用Redis作为队列存储
    while ($data = $queue->pop()) {
        $task = json_decode($data, true);
        sendMail($task['to'], $task['subject'], $task['content']);
    }
}

// 示例代码
queueMail('example@example.com', 'Hello', 'This is a test email');
processMailQueue();

?>

<?php

// 批量插入数据到MySQL
function bulkInsert($data) {
    $values = [];
    foreach ($data as $row) {
        $values[] = "('{$row['name']}', '{$row['age']}', '{$row['gender']}')";
    }
    $sql = "INSERT INTO users (name, age, gender) VALUES " . implode(',', $values);
    $db = new PDO('mysql:host=localhost;dbname=test', 'username', 'password');
    $db->exec($sql);
}

// 将数据放入队列
function queueData($data) {
    $queue = new RedisQueue(); // 假设使用Redis作为队列存储
    foreach ($data as $row) {
        $queue->push(json_encode($row));
    }
}

// 从队列中取出数据并批量插入到MySQL
function processQueue() {
    $queue = new RedisQueue(); // 假设使用Redis作为队列存储
    $bulkSize = 100; // 每次批量插入的数据量
    $data = [];
    while ($row = $queue->pop()) {
        $data[] = json_decode($row, true);
        if (count($data) >= $bulkSize) {
            bulkInsert($data);
            $data = [];
        }
    }
    if (!empty($data)) {
        bulkInsert($data);
    }
}

// 示例代码
$data = [
    ['name' => 'Alice', 'age' => 25, 'gender' => 'female'],
    ['name' => 'Bob', 'age' => 30, 'gender' => 'male'],
    ['name' => 'Charlie', 'age' => 35, 'gender' => 'male'],
    // 更多数据...
];
queueData($data);
processQueue();

?>