Precautions for using PHP anti-shake and anti-duplicate submission technology

Notes on the use of PHP anti-shake and anti-resubmission technology

With the development of Internet applications, website and system security issues are becoming more and more important. Among them, anti-shake and anti-resubmission are one of the important means to ensure system security. This article will introduce the precautions for using anti-shake and anti-resubmit technology in PHP, and give specific code examples.

1. Precautions for using anti-shake technology

1.1 What is anti-shake technology
Anti-shake technology means that when the same event is triggered multiple times in a row, only the last Executing processing after triggering can effectively control problems caused by frequent triggering events.

1.2 Usage Scenarios
Anti-shake technology is often used in scenarios such as real-time search input in input boxes and button click submission. Avoid users triggering events frequently, resulting in invalid requests or multiple requests.

1.3 Notes
(1) Set the appropriate anti-shake delay time. A delay that is too long may result in poor user experience, and a delay that is too short may not effectively prevent frequent triggering.
(2) Properly handle the input events of the input box. When implementing functions such as real-time input search by monitoring the input events of the input box, the request needs to be made after a period of time after the user stops typing to avoid a large number of requests.
(3) Carefully handle asynchronous operations in anti-shake functions. If there is an asynchronous operation in the anti-shake function, you need to ensure that no new events are triggered before the asynchronous operation is completed, otherwise it may cause problems.

The following is a sample code that uses anti-shake technology to implement real-time search in the input box:

// HTML
<input type="text" id="search-input" oninput="debounceSearch()">

// JavaScript
function debounceSearch() {
  clearTimeout(timer);  // 清除上一次的延迟执行
  timer = setTimeout(function() {
    let keyword = document.getElementById('search-input').value;
    // 发送搜索请求
    // ...
  }, 300);  // 延迟300毫秒
}

2. Precautions for using anti-duplication submission technology

2.1 What is anti-duplication Submission technology
Anti-repeated submission technology means that when a user submits the same request multiple times, only one request will be processed to avoid problems caused by repeated operations.

2.2 Usage Scenarios
Anti-duplicate submission technology is often used in scenarios such as form submission and order submission. Prevent users from repeatedly submitting orders or forms due to network delays and other reasons.

2.3 Notes
(1) Generate a unique identifier (Token) to prevent repeated submissions. Each time a form or order is submitted, a unique Token is generated and stored in a Session, Cookie, or hidden field. When submitting next time, check whether the Token already exists. If it exists, it will be judged as a repeated submission.
(2) Add Token to the request parameters. When submitting a form or order, add the Token to the request parameter, and the server will verify it after receiving the request.
(3) Set the validity period of Token reasonably. Set the validity period of the Token according to specific business needs. After the validity period, it cannot be submitted again.
(4) Process page jump and result display. After the form or order is submitted, it is necessary to jump to the page or give prompt information in a timely manner to let the user understand the submission result.

The following is a sample code that uses anti-duplicate submission technology to implement order submission:

// PHP
session_start();
if ($_POST && !isset($_SESSION['token'])) {
    // 生成 Token 并存储在 Session 中
    $token = md5(uniqid(rand(), true));
    $_SESSION['token'] = $token;

    // 处理订单提交
    // ...
}

<!-- HTML -->
<form action="submit.php" method="post">
    <input type="hidden" name="token" value="<?php echo $_SESSION['token']; ?>">
    <!-- 表单内容 -->
    ...
    <input type="submit" value="提交">
</form>

The above are the precautions and specific code examples for the use of PHP anti-shake and anti-duplicate submission technology. During use, make reasonable technology selections and configurations based on specific business scenarios and needs to improve system security and user experience. At the same time, you also need to pay attention to security issues to avoid situations such as excessive anti-shake delay or leakage of repeated submission tokens to ensure the normal operation of the system.

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