PHP anti-shake technology: solving the problem of repeated data submission in high concurrency scenarios

PHP anti-shake technology: solving the problem of repeated data submission in high concurrency scenarios

Introduction:
In high concurrency scenarios, users may click buttons frequently Or submit a form, which causes the server to receive multiple identical requests, which may cause repeated submission of data. To solve this problem, we can adopt a technology called "anti-shake". This article will introduce the anti-shake technology in PHP and specific code examples, aiming to help developers better understand how to solve the problem of repeated data submission in high concurrency scenarios.

What is anti-shake technology?
Anti-shake technology means waiting for a certain period of time after the user triggers an event. If the event is triggered again within this period, the time will be reset. Only when the user stops triggering for a period of time will the corresponding action actually be performed. In data submission scenarios, anti-shake technology can effectively avoid repeated submission of data caused by frequent user clicks.

Implementation of anti-shake technology in PHP:
To implement anti-shake technology in PHP, you can implement a simple anti-shake mechanism with the help of Session, Redis and other caches. Below is a specific code example.

<?php
// 防抖时间间隔，单位为秒
$debounceInterval = 5;
// 缓存键名
$cacheKey = 'submit_debounce_key';

// 检查是否存在防抖标记
if (!isset($_SESSION[$cacheKey])) {
    // 如果不存在则设置防抖标记，并设置过期时间
    $_SESSION[$cacheKey] = 1;
    // 设置过期时间为防抖时间间隔
    $_SESSION[$cacheKey . '_expire'] = time() + $debounceInterval;

    // 执行相应的操作
    // TODO: 处理表单提交逻辑

    // 清除防抖标记
    unset($_SESSION[$cacheKey], $_SESSION[$cacheKey . '_expire']);
} else {
    // 存在防抖标记，判断是否已过期
    if ($_SESSION[$cacheKey . '_expire'] <= time()) {
        // 清除过期的防抖标记，重新设置
        unset($_SESSION[$cacheKey], $_SESSION[$cacheKey . '_expire']);
        $_SESSION[$cacheKey] = 1;
        $_SESSION[$cacheKey . '_expire'] = time() + $debounceInterval;

        // 执行相应的操作
        // TODO: 处理表单提交逻辑

        // 清除防抖标记
        unset($_SESSION[$cacheKey], $_SESSION[$cacheKey . '_expire']);
    } else {
        // 如果未过期，则说明此次请求属于重复提交，可以不做任何处理，或者返回相应的提示信息
        echo '请勿重复提交';
        exit;
    }
}
?>

In the above code example, we first define the debounce time interval $debounceInterval, and set the cache key name $cacheKey. When the form is submitted for the first time, the anti-shake mark will be set in the Session, and the expiration time will be set as the anti-shake interval. When the form is submitted again, it will check whether the anti-shake mark exists and whether it has expired, and perform corresponding operations based on the judgment results. If the debounce flag has expired, it is reset and the form submission logic is executed. If the anti-shake mark has not expired, it means that this request is a repeated submission, and no processing can be performed or the corresponding prompt information can be returned.

Summary:
In high-concurrency scenarios, anti-shake technology can effectively solve the problem of repeated data submission and improve user experience and system performance. By using the caching mechanism in PHP, we can easily implement a simple anti-shake mechanism to deal with high concurrent requests. We hope that the code examples in this article can help developers better understand and apply anti-shake technology and improve the stability and reliability of the system.

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