用户频繁请求一个数据，怎样来设计验证码屏蔽-PHP Tutorial-php.cn

Home

Backend Development

PHP Tutorial

用户频繁请求一个数据，怎样来设计验证码屏蔽

WBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWB

Jun 06, 2016 pm 08:44 PM

php

比如一个SNS社区中，一个用户不停添加好友，怀疑是机器人的行为，假设该机器人在某一时间内每隔3秒就发送一个好友请求，系统怎样来辨别这是机器人的行为然后生成验证码加以阻止，想了很久都没想到很好的解决方法

回复内容：

我觉得首先我们不用辨别是不是机器人，这些敏感操作最好带api key。对于该API根据uid或者api key设置 rate limit，例如1分钟不能发送加好友数超过20个。当超过时返回错误提示。假如它还继续发送大量请求，那么机器人无疑，完全禁止该uid的请求。

function 添加朋友(){
    if(没登陆) die;
    if(当前时间-上次添加好友时间>3){
        继续添加好友
    }
    else{
        你添加的太快啦
    }
}

用图片验证码，如果是机器人，他破解需要时间。再限定一分钟同一账号提交数据的次数。

像腾讯，百度的验证码基本可以屏蔽%95的机器人了，网上有类似开源的验证码类。
制定一个规则，比如每个用户一分钟内只能添加10个好友（1分钟内超过5个时出现验证码），每天增加的好友上线为100个（超过50个时出现验证码）。把这些数据存到memcache中，每次用户发送添加好友的请求先对比下是否符合规则

Statement

The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn

How to calculate the total number of elements in a PHP multidimensional array?May 15, 2025 pm 09:00 PM

Calculating the total number of elements in a PHP multidimensional array can be done using recursive or iterative methods. 1. The recursive method counts by traversing the array and recursively processing nested arrays. 2. The iterative method uses the stack to simulate recursion to avoid depth problems. 3. The array_walk_recursive function can also be implemented, but it requires manual counting.

What are the characteristics of do-while loops in PHP?May 15, 2025 pm 08:57 PM

In PHP, the characteristic of a do-while loop is to ensure that the loop body is executed at least once, and then decide whether to continue the loop based on the conditions. 1) It executes the loop body before conditional checking, suitable for scenarios where operations need to be performed at least once, such as user input verification and menu systems. 2) However, the syntax of the do-while loop can cause confusion among newbies and may add unnecessary performance overhead.

How to hash strings in PHP?May 15, 2025 pm 08:54 PM

Efficient hashing strings in PHP can use the following methods: 1. Use the md5 function for fast hashing, but is not suitable for password storage. 2. Use the sha256 function to improve security. 3. Use the password_hash function to process passwords to provide the highest security and convenience.

How to implement array sliding window in PHP?May 15, 2025 pm 08:51 PM

Implementing an array sliding window in PHP can be done by functions slideWindow and slideWindowAverage. 1. Use the slideWindow function to split an array into a fixed-size subarray. 2. Use the slideWindowAverage function to calculate the average value in each window. 3. For real-time data streams, asynchronous processing and outlier detection can be used using ReactPHP.

How to use the __clone method in PHP?May 15, 2025 pm 08:48 PM

The __clone method in PHP is used to perform custom operations when object cloning. When cloning an object using the clone keyword, if the object has a __clone method, the method will be automatically called, allowing customized processing during the cloning process, such as resetting the reference type attribute to ensure the independence of the cloned object.

How to use goto statements in PHP?May 15, 2025 pm 08:45 PM

In PHP, goto statements are used to unconditionally jump to specific tags in the program. 1) It can simplify the processing of complex nested loops or conditional statements, but 2) Using goto may make the code difficult to understand and maintain, and 3) It is recommended to give priority to the use of structured control statements. Overall, goto should be used with caution and best practices are followed to ensure the readability and maintainability of the code.

How to implement data statistics in PHP?May 15, 2025 pm 08:42 PM

In PHP, data statistics can be achieved by using built-in functions, custom functions, and third-party libraries. 1) Use built-in functions such as array_sum() and count() to perform basic statistics. 2) Write custom functions to calculate complex statistics such as medians. 3) Use the PHP-ML library to perform advanced statistical analysis. Through these methods, data statistics can be performed efficiently.

How to use anonymous functions in PHP?May 15, 2025 pm 08:39 PM

Yes, anonymous functions in PHP refer to functions without names. They can be passed as parameters to other functions and as return values of functions, making the code more flexible and efficient. When using anonymous functions, you need to pay attention to scope and performance issues.

See all articles