File storage and cloud storage usage guide for PHP and mini programs

File Storage and Cloud Storage Usage Guide for PHP and Mini Programs

With the development of the Internet, file storage and cloud storage have become an indispensable part of modern development. For PHP development and small program development, file storage and cloud storage are used more frequently. This article will introduce how to use file storage and cloud storage in PHP and mini programs, with code examples.

1. File storage in PHP

In PHP, we can use the file system to store and read files. The following is a sample code that demonstrates how to use PHP to store and read files:

// 文件存储
$file = 'example.txt';
$content = 'This is an example file.';

file_put_contents($file, $content);

// 文件读取
$fileContent = file_get_contents($file);

echo $fileContent;

In the code, the contents are put through the file_put_contents() functionThis is an example file. Store to a file named example.txt. Then read the contents of the file and print it through the file_get_contents() function.

In addition to using the basic file system for storage and reading, PHP also provides other file operation functions, such as copying files, moving files, deleting files, etc. Developers can choose appropriate functions to operate based on actual needs.

2. File storage in the mini program

File storage in the mini program mainly refers to the uploading and downloading of various pictures, audios, videos and other files. The applet provides two APIs, wx.uploadFile() and wx.downloadFile(), to implement file uploading and downloading.

The following is a sample code for file upload in a small program:

// 文件上传
wx.chooseImage({
  success: function(res) {
    const tempFilePaths = res.tempFilePaths;
    wx.uploadFile({
      url: 'https://example.com/upload',
      filePath: tempFilePaths[0],
      name: 'file',
      success: function(res) {
        console.log(res.data);
      }
    })
  }
})

In the code, select the image through wx.chooseImage() and use wx. uploadFile()Upload the image to the server. Developers need to modify url to the actual upload interface address. After successful upload, the data returned by the server can be obtained through res.data.

The following is a sample code for file download in a small program:

// 文件下载
wx.downloadFile({
  url: 'https://example.com/file.png',
  success: function(res) {
    const filePath = res.tempFilePath;
    wx.saveImageToPhotosAlbum({
      filePath: filePath,
      success: function(res) {
        console.log('保存成功');
      }
    })
  }
})

In the code, the file is downloaded through wx.downloadFile() and the downloaded temporary file is Save to photo album. Developers need to modify url to the actual file download address. After successful saving, the prompt message Successful saving can be output in the console.

3. The use of cloud storage

Cloud storage refers to storing files on a cloud server, and uploading, downloading and managing files through API. Currently, there are many cloud storage services on the market, such as Qiniu Cloud, Tencent Cloud, Alibaba Cloud, etc.

The following is a sample code for using Qiniu Cloud Storage:

// PHP代码
require_once('qiniu/autoload.php'); // 引入七牛云SDK

use QiniuStorageUploadManager;
use QiniuAuth;

$accessKey = 'your-access-key';
$secretKey = 'your-secret-key';
$bucket = 'your-bucket';

$auth = new Auth($accessKey, $secretKey);
$token = $auth->uploadToken($bucket);

$uploadManager = new UploadManager();

$filePath = './example.jpg';
$key = 'example.jpg';

list($ret, $err) = $uploadManager->putFile($token, $key, $filePath);
if ($err !== null) {
    echo '文件上传失败';
} else {
    echo '文件上传成功';
}

In the code, you must first introduce the Qiniu Cloud SDK and set the access key and storage space name. Then obtain the upload credentials through the $auth->uploadToken() method. Finally, upload the file through the $uploadManager->putFile() method. After the upload is successful, File Upload Successful can be output in the console. If the upload fails, File Upload Failed will be output.

The above is a guide to the use of file storage and cloud storage in PHP and mini programs, and provides corresponding code examples. Developers can choose the appropriate method to store and read files based on actual needs. Hope this article is helpful to everyone.

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