How to solve the problem that WeChat pictures cannot be sent in PHP development

When using WeChat public accounts for development and maintenance, we often encounter the problem that pictures cannot be sent normally. Especially when using PHP language for development, the problem of images not being sent properly becomes even more difficult because the API interface documentation of the WeChat official account is not detailed enough. This article will introduce in detail how WeChat PHP handles the problem of sending pictures and provide some common solutions.

Problem Analysis

When trying to send pictures to the WeChat official account, we may encounter the following common problems:

1. The picture upload failed;
2. The image was uploaded successfully, but cannot be displayed;
3. The image was displayed successfully, but there are problems with size, dimensions, etc.

From these questions, we can see that the WeChat API has relatively strict requirements for sending pictures. Therefore, we need to pay special attention to the following aspects when dealing with related issues:

1. The path and address of the picture;
2. The size and size of the picture;
3. Code implementation details.

Solution

In view of the above problems, we can adopt the following solutions:

1. The path and address of the picture

When using WeChat API to upload images, we need to pay attention to the path and address of the image. At this time, the picture needs to be uploaded to the WeChat server first and then sent to the user. Therefore, we need to store the image in a location that can be accessed by the server. Usually, we can store the image in the public folder of the server and then obtain the image through the file path. During the PHP code implementation process, we can use $_SERVER['DOCUMENT_ROOT'] to obtain the absolute path of the server.

2. The size and size of the image

When uploading the image, we also need to pay attention to the size and size of the image. Because the WeChat API has very clear restrictions on image size and size. Specifically, WeChat requires that the size of the uploaded image does not exceed 2M, and the aspect ratio of the image cannot exceed 3:1.

Usually, we can solve the problem of excessive image size through image compression. During the PHP code implementation process, we can use ImageMagick or GD library to achieve image compression. In addition, we also need to pay attention to the file format of the uploaded image. Usually, WeChat API only supports uploading images in jpg, jpeg, gif, png and other formats.

3. Details of code implementation

In the process of PHP code implementation, we also need to pay attention to some details. Specifically, we need to pay attention to the following aspects:

3.1 File upload method

WeChat API supports two upload methods: multipart/form-data and application/json. For the problem of sending pictures, we need to use multipart/form-data to upload.

3.2 Details of code implementation

We need to pay attention to the details of code implementation. During the PHP code implementation process, we need to pay attention to details such as setting curl attributes and HTTP request header information. In addition, you also need to pay attention to the PHP version issue, because the WeChat API has certain requirements for the PHP version.

Summary

To sum up, the WeChat API has relatively strict requirements for sending pictures. Therefore, during the PHP code implementation process, we need to pay special attention to the path and address of the image, the size and size of the image, and the details of the code implementation. Through the above solutions, we can solve the problem of images being unable to be uploaded and sent, and successfully complete related work in actual development.

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