Implementation Guide for File Upload and Download Functions in WeChat Mini Programs Developed with EasyWeChat and PHP

EasyWeChat (ECW for short) is a WeChat development toolkit based on PHP. It provides developers with a series of convenient API interfaces for developing WeChat public accounts, WeChat applets and other applications. In this article, we will introduce how to use EasyWeChat and PHP to develop the file upload and download functions of WeChat applet.

First, we need to configure the relevant information of the mini program in EasyWeChat and obtain the appID and appSecret of the mini program. For specific configuration methods, please refer to EasyWeChat official documentation.

The file upload function can be implemented through the uploadFile interface of the WeChat applet. In PHP, we can use the interface provided by EasyWeChat to call the WeChat API. First, we need to instantiate an EasyWeChat object and pass in the appID and appSecret of the applet.

use EasyWeChatFactory;

$config = [
    'app_id' => 'your-app-id',
    'secret' => 'your-app-secret',
];

$app = Factory::miniProgram($config);

Next, we can upload the file by calling the uploadFile method. Taking uploading images as an example, we need to pass in the path of the file to be uploaded. This method will return an array containing the file ID and file path.

$response = $app->media->uploadImage($filePath);
$fileId = $response['media_id'];
$filePath = $response['path'];

The file download function can be implemented through the downloadFile interface of the WeChat applet. We need to pass in the file ID of the file to be downloaded, and the path to be saved locally.

$app->media->download($mediaId, $savePath);

The above is the basic process of using EasyWeChat and PHP to develop the file upload and download functions of WeChat applet.

The following is a complete sample code that demonstrates how to upload and download files:

use EasyWeChatFactory;

$config = [
    'app_id' => 'your-app-id',
    'secret' => 'your-app-secret',
];

$app = Factory::miniProgram($config);

// 上传图片
$filePath = '/path/to/image.jpg';
$response = $app->media->uploadImage($filePath);
$fileId = $response['media_id'];
$filePath = $response['path'];

// 下载文件
$mediaId = 'your-media-id';
$savePath = '/path/to/save/file.jpg';
$app->media->download($mediaId, $savePath);

In the above sample code, we called the uploadImage method and of EasyWeChat download method to implement file upload and download functions. In actual development, we can use different upload and download interfaces according to specific needs, such as uploadVideo, uploadVoice, etc.

Summary:
By using EasyWeChat and PHP to develop the file upload and download functions of the WeChat applet, we can realize file transfer between the applet and the server. The above sample code can be used as a basic framework, which can be modified and expanded according to actual needs. I hope this article will be helpful to you when developing WeChat mini programs.

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