Implementation method of sliding verification code developed in PHP in WeChat mini program

With the rapid development of the Internet, network security issues have become more and more serious. In response to security threats such as malicious attacks and fraudulent transactions, many websites and applications use verification codes to protect user information and system security. How to implement a safe and reliable sliding verification code in WeChat mini program? This article will introduce the implementation of sliding verification code developed using PHP.

1. The principle of sliding verification code

Sliding verification code means that when verifying the user's identity, the user completes the verification process by sliding on the slider. The principle is to divide a picture into two parts, one part contains the puzzle pieces, and the other part is the blank area. Users need to complete the verification process by sliding puzzle pieces into empty spaces.

2. Implementation method

The WeChat applet uses a sliding verification code developed in PHP. You can use the following steps:

1. Generate a verification code for the user

By generating a random number, a verification code picture containing puzzle pieces is randomly generated. Store the random number in the session for subsequent verification.

2. Generate a slider

Cut a puzzle piece from the verification code image and generate a slider. The size of the slider and the size of the captcha image should be equal. Add gesture detection events on the slider for subsequent drag verification.

3. Draw the verification code picture

Draw the generated verification code picture with puzzle pieces through the PHP function and output it to the page. You can use PHP GD library, Imagick library and other tools to draw verification code images.

4. Verify user behavior

The user completes the verification process by dragging the slider to drag the puzzle pieces into the blank area. When dragging is completed, it is determined whether the user has completed the verification by calculating the displacement of the slider from the initial position. If the user's operation is legal, the user identity authentication is considered passed.

5. Clear session

After completing user authentication, clear the random number in the session to ensure that each authentication is independent.

3. Notes

In the WeChat mini program, the following points need to be noted when implementing the sliding verification code:

1. The difficulty of the verification code needs to be appropriate

The harder the verification code is, the more effective it is in preventing robot attacks. But verification codes that are too difficult can also affect user experience. There needs to be a balance between difficulty of implementation and user experience.

2. The accuracy requirements for user dragging should not be too high

If the position of the slider needs to match completely, the user experience will become very poor and it is easy for users to make operational errors. It should be ensured that the user's drag accuracy requirements are not too high, and the user's operational errors can be tolerated to a certain extent.

3. Use an appropriate sliding algorithm

There are many algorithms used in sliding verification codes, including Bezier curves, simulated physics, etc. Different algorithms have different implementation difficulties and usage effects. An appropriate sliding algorithm should be chosen to ensure the reliability and user experience of the captcha.

4. Summary

Sliding verification code is an effective security verification method that can effectively protect the security of user information and applications. Using the sliding verification code developed in PHP in the WeChat applet can be achieved by generating verification codes, generating sliders, drawing verification code pictures, verifying user behavior, and clearing sessions. During the implementation process, attention should be paid to issues such as appropriate difficulty, not too high accuracy requirements, and the use of appropriate sliding algorithms.

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