How to use PHP to develop the file management function of WeChat applet?

How to use PHP to develop the file management function of WeChat applet?

As a lightweight application, WeChat applet is increasingly popular among ordinary users and developers. Developers can implement various functions through the WeChat applet interface, including file management functions. This article will introduce how to use PHP to develop the file management function of WeChat applet and give specific code examples.

1. Create a mini program

First, you need to create a mini program on the WeChat mini program platform. This requires you to have a WeChat official account and a developer account. After creating a mini program on the mini program platform, you can obtain an appID of the mini program, which is your unique identifier for interacting with the mini program.

2. Configure the mini program background

After creating the mini program, you need to perform some configurations in the mini program background. Find the "Development" → "Development Settings" page in the mini program background, and enable the "Development Environment", "Server Domain Name" and "Upload DownloadFile Legal Domain Name" functions. These settings will allow your applet to interact with the server.

3. Write PHP code

Next, you need to write PHP code on the server to implement the file management function. Below we take the two functions of file upload and file download as examples to give specific code examples.

1. File upload function

header("Content-type:text/html;charset=utf-8");
$ret = array();

if ($_SERVER['REQUEST_METHOD'] == 'POST' && $_FILES'file' == UPLOAD_ERR_OK) {

$file = $_FILES['file'];
//上传文件的临时存储路径
$tmp_name = $file['tmp_name'];
//上传文件的原始名称
$name = $file['name'];
//上传文件的保存路径
$save_path = "/path/to/save/" . $name;
if (move_uploaded_file($tmp_name, $save_path)) {
    $ret['code'] = 0;
    $ret['msg'] = '上传成功';
} else {
    $ret['code'] = -1;
    $ret['msg'] = '上传失败';
}

} else {

$ret['code'] = -1;
$ret['msg'] = '上传失败';

}

echo json_encode($ret);
?>

2. File download function

header("Content-type:text/html;charset=utf-8");
$file_path = "/path/to/file";

if (file_exists($file_path) ) {

header('Content-Type: application/octet-stream');
header('Content-Disposition: attachment; filename="' . basename($file_path) . '"');
header('Content-Length: ' . filesize($file_path));
readfile($file_path);

} else {

echo "文件不存在";

}
?>

4. Call the API interface

to complete the server-side file upload and After downloading the function, you need to call the API interface on the mini program to implement the file management function. You can use the wx.uploadFile and wx.downloadFile methods of the applet to upload and download files respectively. Specific code examples are as follows:

1. File upload:

wx.chooseImage({
count: 1,
success: function (res) {

var tempFilePaths = res.tempFilePaths;
wx.uploadFile({
  url: 'https://your-domain.com/upload.php', 
  filePath: tempFilePaths[0],
  name: 'file',
  success: function (res) {
    console.log(res.data)
  }
})

}
})

2. File download:

wx.downloadFile({
url: 'https://your-domain .com/download.php',
success: function (res) {

console.log(res.tempFilePath)
wx.saveFile({
  tempFilePath: res.tempFilePath,
  success: function (res) {
    console.log(res.savedFilePath)
  }
})

}
})

By calling the API interface, you can implement files in the mini program Upload and download functions, thereby realizing the file management function of WeChat applet.

Summary

This article introduces how to use PHP to develop the file management function of WeChat applet and gives specific code examples. Through these code examples, you can implement file upload and download functions on the server side, and by calling the API interface, you can implement file upload and download operations on the mini program side. I hope this article will be helpful to you in developing the file management function of WeChat applet!

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