How to download files from WeChat applet through back-end PHP

Scenario: The WeChat applet calls the wx.downloadFile() API to download a file, and the PHP backend performs processing and returns the file process;
Process:
1. The applet displays a list of files that need to be downloaded;
2. Click download and request the PHP interface, carrying a parameter for the name of the file you want to download;
3. Receive the parameter in PHP, and then search the folder to see if there is the file;
4. Find file and return the file to the applet;
5. The applet saves the file returned by the backend, click to open the file, and preview the code:
wxml

文件列表

  文件名：{{item.fileName}} 点击下载

  dom: function (e) {
    var index = e.currentTarget.id;
    var data = this.data.search_store[index].fileName
    var that = this;
    wx.downloadFile({
      url: 'https://dwb.lynncain.cn/H5/dom.php?str=' + data, //下载路径携带 参数=文件名
      success: function (res) {
        console.log(res.tempFilePath)
        wx.saveFile({ //下载成功后保存
          tempFilePath: res.tempFilePath,
          success: function (res) {
           wx.showToast({
             title: '下载成功！',
           })
           wx.getSavedFileList({ //获取下载的文件列表保存到data
             success: function (rrr) {
               console.log(rrr.fileList)
               that.setData({
                 fileList: rrr.fileList
               })
             }
           })
          }
        })
      }
    })
  },

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