How to use PHP Developer City to implement user rating function

How to use PHP Developer City to implement user rating function

With the rapid development of e-commerce, shopping websites have become the main channel for people to purchase goods. In order to provide a better shopping experience, the mall website has introduced a user rating function. Through user ratings, consumers can evaluate the quality, price, service, etc. of the product, thereby providing a reference for other consumers. This article will introduce how to use PHP Developer City to implement the user rating function.

1. Database design

Before developing the user rating function of the city, you first need to design the rating-related database tables. Generally speaking, the rating function needs to include a product table and a rating table. The product table is used to store basic information about the product, such as product name, price, inventory, etc. The rating table is used to store user rating information for products, including rater ID, product ID, rating level, etc.

2. User rating page design

The user rating page is the interface for users to perform rating operations and needs to contain product information and rating options. Users can see the rating of the current product on the product details page and perform rating operations. In order to ensure the accuracy of ratings, users can only rate each product once. After the rating operation is completed, users can see their rating results.

In PHP, you can use HTML and CSS to design user rating pages. HTML is used to build the structure of the page, and CSS is used to beautify the style of the page. On the page, you can use PHP code to obtain product information, and query the rating table through the database to obtain the rating of the product.

3. Rating processing

After the user completes the rating operation, the rating data needs to be processed and saved to the database. In PHP, you can submit the rating data to the backend using form submission. The back-end PHP code can obtain the rating data submitted by the form through the $_POST global variable, and then insert the data into the rating table.

Before inserting rating data, you should first determine whether the user has rated the product. You can determine whether the user has rated by querying the rating table. If it has already been rated, you can update it. If there is no rating record, insert it.

4. Rating display

Rating display is an important part of the user rating function in the mall. Through the rating display, users can view other users' evaluations of the product to understand the product's advantages and disadvantages. In PHP, you can use database query operations to obtain product rating data and display it on the product details page.

In order to improve the readability of rating display, you can use a chart plug-in to display rating data. Charts can visually display the distribution of ratings, allowing users to understand the ratings of products more intuitively.

5. Rating calculation

In the mall, rating calculation is an important link. Through rating calculation, the average rating of each product can be obtained. In PHP, you can use SQL query statements to calculate the average rating. By taking the average, operations such as product ranking and recommendation can be performed more conveniently.

You can use the following SQL query to calculate the average rating:
SELECT AVG(rating) FROM rating_table WHERE product_id = $product_id

6. Rating permission control

In order to ensure the fairness of the ratings, the mall should control the permissions of the ratings. Only users who purchased the item can rate the item. In PHP, you can control the rating permissions by determining whether the user has purchased the product. You can obtain user purchase records through database queries to determine whether the user has the right to rate.

7. Security considerations

Finally, in order to ensure the security of the scoring system, we should consider the security of the scoring system. You can protect the scoring system from attacks such as SQL injection by using PHP's security functions to filter and validate user input. At the same time, reasonable security processing is also required for the display and storage of rating data to protect user privacy and the integrity of rating data.

Summary:

Through the above steps, we can use the PHP Developer City to implement the user rating function. Through user ratings, the mall can provide a better shopping experience and also provide product references for other users. During the development process, we need to reasonably design the database table structure, page design and scoring processing logic to ensure the normal operation of the scoring function. At the same time, we also need to consider issues such as score display, score calculation, permission control, and security. Through reasonable design and development, we can implement a fully functional, safe and reliable user rating system.

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