PHP Debounce Technique: How to Avoid Data Duplicate Submission in High Concurrency Scenarios

PHP Debounce Technique: How to Avoid Data Duplicate Submission in High Concurrency Scenarios

In high concurrency scenarios, users may frequently click buttons or submit forms, which can lead to multiple identical requests being sent to the server, potentially causing data duplication. To effectively solve this issue, we can use a technique called "debounce." This technique helps avoid data duplication caused by frequent user interactions such as clicking a button or submitting a form.

What is Debounce Technique?

The debounce technique is an event handling mechanism that sets a delay time. If the event is triggered again within this time, the timer is reset. The action will only be performed when the event has not been triggered for a certain period. In data submission scenarios, this technique can effectively prevent duplicate submissions caused by users clicking buttons or submitting forms multiple times.

Implementing Debounce Technique in PHP

In PHP, debounce can be implemented using caching mechanisms like Session or Redis to record the debounce state, ensuring that duplicate submissions do not occur within the defined time interval. Below is an example of implementing debounce using Session in PHP:

<?php
// Debounce interval in seconds
$debounceInterval = 5;

// Cache key
$cacheKey = 'submit_debounce_key';

// Check if the debounce flag exists
if (!isset($_SESSION[$cacheKey])) {
    // If not, set the debounce flag and expiry time
    $_SESSION[$cacheKey] = 1;
    $_SESSION[$cacheKey . '_expire'] = time() + $debounceInterval;
    // Execute the corresponding operation
    // TODO: Handle form submission logic
    // Clear debounce flag
    unset($_SESSION[$cacheKey], $_SESSION[$cacheKey . '_expire']);
} else {
    // Debounce flag exists, check if it has expired
    if ($_SESSION[$cacheKey . '_expire'] <= time()) {
        // Clear the expired debounce flag and reset
        unset($_SESSION[$cacheKey], $_SESSION[$cacheKey . '_expire']);
        $_SESSION[$cacheKey] = 1;
        $_SESSION[$cacheKey . '_expire'] = time() + $debounceInterval;
        // Execute the corresponding operation
        // TODO: Handle form submission logic
        // Clear debounce flag
        unset($_SESSION[$cacheKey], $_SESSION[$cacheKey . '_expire']);
    } else {
        // If not expired, this request is considered a duplicate submission, you can choose to do nothing or return a relevant message
        echo 'Please do not submit repeatedly';
        exit;
    }
}
?>

In this example, we define the debounce interval `$debounceInterval` and the cache key `$cacheKey`. On the first form submission, a debounce flag is set in the Session, and an expiration time is assigned based on the debounce interval. When submitting again, the system checks if the debounce flag exists and whether it has expired. If it has expired, the flag is reset, and form submission logic is executed. If it hasn't expired, a message like "Please do not submit repeatedly" is shown.

Conclusion

The debounce technique can effectively solve the problem of duplicate data submissions in high concurrency scenarios. By using a caching mechanism, we can significantly improve system stability and user experience. PHP offers an easy-to-use approach to implement this technique, which developers can adapt to their specific needs.