How to deal with duplicate request problems in PHP development

How to deal with the problem of repeated request submission in PHP development

When doing web development, we often encounter the problem of repeated request submission. When a user clicks the submit button multiple times on a web page or refreshes the page, the same request may be submitted multiple times, resulting in repeated insertion or repeated processing of data. This will not only affect the normal operation of the system, but may also cause data chaos and conflicts. In order to solve this problem, we can adopt some common methods and strategies.

1. Front-end prevents repeated submissions

In the front-end page, you can prevent repeated submissions through the following methods:

a) Disable the submit button: In the form After submission, the submit button can be set to a disabled state to prevent users from clicking submit repeatedly. It can be implemented using JavaScript code, for example:

document.getElementById('submitBtn').disabled = true;

b) Display loading status: After the form is submitted, a loading prompt can be displayed to tell the user that it is being processed, so as to prevent the user from clicking submit multiple times. Loading status can be achieved using CSS styles or JavaScript code.

c) Reload the page after the submission is completed: After the form submission is completed, the page can be reloaded by redirecting or refreshing the page to prevent the user from refreshing the page and submitting again. This can be done using PHP code or JavaScript code.

2. The backend prevents repeated submissions

When the backend processes requests, the following methods can also be used to prevent repeated submissions:

a) Generate unique Identifier: Generate a unique identifier (for example, from a UUID) on each request and store the identifier in the Session or Cookie. Before each request is processed, check whether the identifier already exists. If it exists, it means repeated submission and the request will no longer be processed.

b) Token verification: Embed a randomly generated Token in each form page and store the Token in the Session. When the form is submitted, the Token value is submitted to the backend as a hidden field. When processing a request, the backend first verifies whether the Token is valid, and if it is invalid, refuses to process the request.

c) Idempotent design: Operations that may be submitted repeatedly must be designed to be idempotent, that is, the results of multiple executions are consistent with the results of one execution. For example, when inserting into a database, you can use INSERT IGNORE or ON DUPLICATE KEY UPDATE to ensure the uniqueness of the data.

3. Back-end business logic processing

In addition to the anti-repetitive submission strategy of the front-end and back-end, corresponding processing should also be carried out according to specific business needs:

a) Return a success message: After the submission is successful, in order to avoid misoperation by the user, a success message should be returned to inform the user that the operation has been successfully completed.

b) Prompt the user for the operation result: After the submission is successful, you can inform the user of the operation result through message prompts or pop-up windows, and remind the user to refresh the page or return to the previous page.

c) Regularly clean up invalid data: In the database or cache, duplicate data may be stored due to repeated submission requests. To avoid data chaos and conflicts, invalid data can be cleaned regularly to maintain data consistency.

Summary

Repeated submission of requests is a common problem in web development. Improper handling may lead to repeated processing of data and data conflicts. In order to solve this problem, we can carry out multi-level anti-duplicate submission strategies on the front end and back end, and perform corresponding processing according to business needs. Maintaining system reliability and data consistency and improving user experience are issues we cannot ignore in web development.

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