How to like product reviews in PHP Developer City

In modern e-commerce platforms, product reviews are one of the most important references for consumers when choosing products. In order to further improve the user experience, many malls will add a like function for users to like comments on their favorite products. This article will introduce how to use the product review and like function in PHP Developer City.

1. Create database tables
First, create two tables in the MySQL database, namely "comments" and "likes". The "comments" table is used to store product review information, and the "likes" table is used to record the user's like information on the comments. The "comments" table can include the following fields: comment ID (comment_id), comment content (content), user ID (user_id) and product ID (product_id). The "likes" table can include the following fields: like ID (like_id), user ID (user_id) and comment ID (comment_id).

2. Front-end display
On the product details page, display the product’s review list and display a like button for each review. You can use HTML and CSS to create the style of the review list, and use PHP code to obtain review information from the database and dynamically generate the review list.

3. Implementation of the like function

1. When the like button is clicked, an Ajax request is sent to the server and the relevant information is passed to the backend.
2. After the backend receives the request, it first queries the "likes" table to check whether the user has liked the comment. If it has been liked, cancel the like and delete the corresponding record from the "likes" table; if it has not been liked, perform a like operation and insert the user ID and comment ID into the "likes" table.
3. Update the number of likes in the database: Add a field to the "comments" table to record the number of likes for each comment (such as likes_count). When giving a like, first query the "likes" table through the comment ID to get the number of likes for the comment, then add or subtract 1, and update the likes_count field in the "comments" table.
4. After the backend processes the like operation, it returns the corresponding results to the front end, such as whether the operation is successful and the number of likes for the current comment.

4. Front-end update
On the front-end page, update the status of the like button based on the results returned by the back-end, for example, change it to the liked style, and display the updated like button quantity.

5. Security considerations
In order to ensure system security, some security considerations need to be made:

1. Verify user requests to ensure that only legitimate users can like operate.
2. To prevent malicious likes, you can limit the number of times a user can like a single comment. For example, each user can only like once.

Through the above steps, we can implement the like function of product reviews in the mall developed by PHP. This feature can not only improve user engagement and satisfaction, but also provide valuable reference information to other consumers and promote communication and purchasing behavior. At the same time, we must also pay attention to ensuring the security of the system and ensuring the normal operation of the like function.

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