How to use PHP to achieve text waterfall flow effect in WeChat mini program

With the popularity of mobile devices, WeChat mini programs have become the choice of more and more companies and individuals. However, in the development process of small programs, achieving the waterfall flow effect is a difficult task. This article will introduce how to use PHP to implement the text waterfall flow effect in WeChat applet.

1. How to implement the waterfall flow effect

The waterfall flow effect refers to the visual effect of arranging elements of different heights in order to make them look like flowing waterfalls. In the implementation of waterfall flow effect on the Web, the commonly used method is through CSS Column layout and JavaScript script. But in the WeChat applet, using CSS Column layout cannot achieve the desired effect, so we need to use PHP scripts to complete it.

2. The key to using PHP to achieve the waterfall flow effect

The key to using PHP to achieve the waterfall flow effect is to determine the height of each element so that they can flow in a coordinated manner. To do this, we need to use PHP's GD library to calculate the height of each element.

GD library is an extension library for processing images in PHP. It provides many image operation functions. In this article, we will use the functions in the GD library to perform text watermarking, scaling, and cropping operations to achieve the text waterfall flow effect in the WeChat applet.

3. Steps to achieve waterfall flow effect

1. Get text data from the server

Since the WeChat applet cannot directly operate the file system, we need to Store text data on the server side and get data from the server. In PHP, you can use the file reading function file_get_contents() to obtain text data.

2. Split and format text data

According to the requirements of the text flow style in the mini program, each text needs to be displayed in a new line, and a certain amount of space is left at the top and bottom. white space. Therefore, before displaying the data, we need to process the text data, wrap each text in an appropriate HTML tag, and output it in a specific format to meet the requirements of the waterfall flow layout.

3. Calculate the height of text

In waterfall layout, the height of text is the key factor. We need to calculate the height of each text when displayed through the function provided in the GD library. After calculating the height of each text, we can sort them by height from small to large.

4. Generate images

In order to display the text waterfall flow in the WeChat applet, we need to convert each calculated text into an image. In PHP, you can use functions in the GD library to convert text into images to achieve a waterfall effect. At the same time, we need to scale and crop the image to adapt to different screen sizes.

5. Send the image to the mini program

After generating the image, we need to send the image to the mini program for display. You can use the readfile() function in PHP to output the binary data of the image to the client.

4. Summary

This article introduces how to use PHP to achieve the text waterfall flow effect in WeChat applet. By calculating the text height, generating images and sending them to the mini program, we can easily implement the waterfall flow layout effect in the mini program. At the same time, we also need to pay attention to the scaling and cropping of images to ensure the display effect on different screen sizes.

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