


Requirements: The program prepares a number of QR codes for the public account. The total amount is * 10,000 yuan. It is required to scan the code to receive it. Each QR code corresponds to a red envelope. It cannot be received repeatedly after receiving it. This is different from the ordinary scan code to send red envelope advertisements. Then There is only one QR code, which can be scanned and spread by anyone, while supplies last. Problem: There may be a problem of guessing other red envelope links based on the URL. There is no QR code (the QR code here should control the red envelope to be sent to) Whoever doesn’t send it to anyone) can also receive it.
The method that has been thought of:
Write an encryption method, use timestamp, random number and a predefined token (or code) to encrypt, and also include the QR code link after it The timestamp random number and token are scanned and compared with the parameters encrypted and the stored encrypted string to verify whether it is legal. This may prevent people who guess the URL from receiving red envelopes
Reply content:
Requirements: The program prepares a number of QR codes for the public account. The total amount is * 10,000 yuan. It is required to scan the code to receive it. Each QR code corresponds to a red envelope. It cannot be received repeatedly after receiving it. This is different from the ordinary scan code to send red envelope advertisements. Then There is only one QR code, which can be scanned and spread by anyone, while supplies last. Problem: There may be a problem of guessing other red envelope links based on the URL. There is no QR code (the QR code here should control the red envelope to be sent to) Whoever doesn’t send it to anyone) can also receive it.
The method that has been thought of:
Write an encryption method, use timestamp, random number and a predefined token (or code) to encrypt, and also include the QR code link after it The timestamp random number and token are scanned and compared with the parameters encrypted and the stored encrypted string to verify whether it is legal. This may prevent people who guess the URL from receiving red envelopes
I don’t know if you guys have any good methods
1. First of all, how do you get the QR code? This is the point. You absolutely need a mechanism to control users’ acquisition of QR codes. This is the key point! !
2. Regarding the uniqueness of the QR code URL, it is easy to solve. You can write an asymmetric encryption algorithm, put the encrypted string in the URL, and check it with the algorithm every time it is requested.
3. You can add browser feature judgment, what? Browser judgment? ? This means that people who intend to attack will always scan your page directly. After scanning, there will be no features that browsers have, such as loading page resources, such as img, script, css..., there are many. How to judge specifically is up to you. think.
4. Don’t trust openid, IP, and mobile phone number, they are useless.
5. When it comes to this, if you strictly implement the above, you can basically eliminate 80% of fake customers.
6. WeChat itself has an anti-swipe mechanism, so you can rest assured.
7. What’s even more critical is that there is still a way to survive.
8,...

PHPsessionstrackuserdataacrossmultiplepagerequestsusingauniqueIDstoredinacookie.Here'showtomanagethemeffectively:1)Startasessionwithsession_start()andstoredatain$_SESSION.2)RegeneratethesessionIDafterloginwithsession_regenerate_id(true)topreventsessi

In PHP, iterating through session data can be achieved through the following steps: 1. Start the session using session_start(). 2. Iterate through foreach loop through all key-value pairs in the $_SESSION array. 3. When processing complex data structures, use is_array() or is_object() functions and use print_r() to output detailed information. 4. When optimizing traversal, paging can be used to avoid processing large amounts of data at one time. This will help you manage and use PHP session data more efficiently in your actual project.

The session realizes user authentication through the server-side state management mechanism. 1) Session creation and generation of unique IDs, 2) IDs are passed through cookies, 3) Server stores and accesses session data through IDs, 4) User authentication and status management are realized, improving application security and user experience.

Tostoreauser'snameinaPHPsession,startthesessionwithsession_start(),thenassignthenameto$_SESSION['username'].1)Usesession_start()toinitializethesession.2)Assigntheuser'snameto$_SESSION['username'].Thisallowsyoutoaccessthenameacrossmultiplepages,enhanc

Reasons for PHPSession failure include configuration errors, cookie issues, and session expiration. 1. Configuration error: Check and set the correct session.save_path. 2.Cookie problem: Make sure the cookie is set correctly. 3.Session expires: Adjust session.gc_maxlifetime value to extend session time.

Methods to debug session problems in PHP include: 1. Check whether the session is started correctly; 2. Verify the delivery of the session ID; 3. Check the storage and reading of session data; 4. Check the server configuration. By outputting session ID and data, viewing session file content, etc., you can effectively diagnose and solve session-related problems.

Multiple calls to session_start() will result in warning messages and possible data overwrites. 1) PHP will issue a warning, prompting that the session has been started. 2) It may cause unexpected overwriting of session data. 3) Use session_status() to check the session status to avoid repeated calls.

Configuring the session lifecycle in PHP can be achieved by setting session.gc_maxlifetime and session.cookie_lifetime. 1) session.gc_maxlifetime controls the survival time of server-side session data, 2) session.cookie_lifetime controls the life cycle of client cookies. When set to 0, the cookie expires when the browser is closed.


Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Article

Hot Tools

MinGW - Minimalist GNU for Windows
This project is in the process of being migrated to osdn.net/projects/mingw, you can continue to follow us there. MinGW: A native Windows port of the GNU Compiler Collection (GCC), freely distributable import libraries and header files for building native Windows applications; includes extensions to the MSVC runtime to support C99 functionality. All MinGW software can run on 64-bit Windows platforms.

PhpStorm Mac version
The latest (2018.2.1) professional PHP integrated development tool

SublimeText3 Linux new version
SublimeText3 Linux latest version

mPDF
mPDF is a PHP library that can generate PDF files from UTF-8 encoded HTML. The original author, Ian Back, wrote mPDF to output PDF files "on the fly" from his website and handle different languages. It is slower than original scripts like HTML2FPDF and produces larger files when using Unicode fonts, but supports CSS styles etc. and has a lot of enhancements. Supports almost all languages, including RTL (Arabic and Hebrew) and CJK (Chinese, Japanese and Korean). Supports nested block-level elements (such as P, DIV),

Dreamweaver Mac version
Visual web development tools
