Xcode Swift/PHP/SQL上载多个图像失败

Question

我正在学习“将图像上传到服务器”，但当我尝试上传多个图像时，总是无法报告（JSON错误，来自iOS设备上的Xcode警报），似乎错误在PHP端？但我是新来的，所以任何人都可以帮我找到解决办法。Xcode:

>

httpBody函数

func createBodyWithParameters（参数：[字符串：任意]？，边界：字符串）-

 if parameters != nil {
     for (key, value) in parameters! {
         body.append("--\(boundary)\r\n".data(using: .utf8)!)
         body.append("Content-Disposition: form-data; name=\"\(key)\"\r\n\r\n".data(using: .utf8)!)
         body.append("\(value)\r\n".data(using: .utf8)!)
     }
 }

 for image in images {
     let filename = "\(NSUUID().uuidString).jpg"
     let imageData = image.jpegData(compressionQuality: 1)
     let lineOne = "--" + boundary + "\r\n"
     body.append(lineOne.data(using: .utf8, allowLossyConversion: false)!)
     let lineTwo = "Content-Disposition: form-data; name=\"files\"; filename=\"\(filename)\"\r\n"
     body.append(lineTwo.data(using: .utf8, allowLossyConversion: false)!)
     let lineThree = "Content-Type: image/jpg\r\n\r\n"
     body.append(lineThree.data(using: .utf8, allowLossyConversion: false)!)
     body.append(imageData!)
     let lineFive = "\r\n"
     body.append(lineFive.data(using: .utf8, allowLossyConversion: false)!)
 }

 let lineSix = "--" + boundary + "--\r\n"
 body.append(lineSix.data(using: .utf8, allowLossyConversion: false)!)
 return body

}

http请求函数

 func createRequest(parameters: [String : Any] , url : URL) -> URLRequest {

 var request = URLRequest(url: url)
 request.httpMethod = "POST"
 let boundary = "Boundary-\(NSUUID().uuidString)"
 request.setValue("multipart/form-data; boundary=\(boundary)", forHTTPHeaderField: "Content-Type")

 request.httpBody = createBodyWithParameters(parameters: parameters, boundary: boundary) as Data

 return request

}

多图像上载函数func uploadPostWithMultipleImages（）{

 guard let id = currentUser?["id"], let text = postTextView.text else {
     return
 }

 // declaring keys and values to be sent to the server
 let parameters = ["user_id": id, "text": text, "files": images]

 // declaring URL and request
 let url = URL(string: "http://localhost/projectExample/uploadPostMultipleImages.php")!

 let request = createRequest(parameters: parameters, url: url)

 URLSession.shared.dataTask(with: request) { (data, response, error) in
     DispatchQueue.main.async {

         // if error
         if error != nil {
             Helper().showAlert(title: "Server Error", message: error!.localizedDescription, in: self)
             return
         }

         // access data / json
         do {

             // safe mode of accessing received data from the server
             guard let data = data else {
                 Helper().showAlert(title: "Data Error", message: error!.localizedDescription, in: self)
                 return
             }

             // converting data to JSON
             let json = try JSONSerialization.jsonObject(with: data, options: .allowFragments) as? NSDictionary

             // safe mode of accessing / casting JSON
             guard let parsedJSON = json else {
                 return
             }

             // if post is uploaded successfully -> come back to HomeVC, else -> show error message
             if parsedJSON["status"] as! String == "200" {

                 // post notification in order to update the posts of the user in other viewControllers
                 NotificationCenter.default.post(name: NSNotification.Name(rawValue: "uploadPost"), object: nil)

                 // comeback
                 self.dismiss(animated: true, completion: nil)

             } else {
                 Helper().showAlert(title: "Error", message: parsedJSON["message"] as! String, in: self)
                 return
             }

             // error while accessing data / json
         } catch {
             Helper().showAlert(title: "JSON Error", message: error.localizedDescription, in: self)
             return
         }
     }

 }.resume()

}

PHP上传代码

 // generating absolute path to the folder for every user with his unique id

##############################################################################################################

//如果（！file_exists（$folder））{mkdir（$folder，0777，true）；}或者{$return['folder_message']='无法创建目录'；}则创建不存在的fodler

 foreach($_FILES['files']['name'] as $key =>$value) {

 $file = $_FILES['files']['name'][$key];
 $file_tmp = $_FILES['files']['tmp_name'][$key];
 // path to the file. Full path of the file
 $path = $folder . '/' . basename($file); 

 if (move_uploaded_file($file_tmp, $path)) {
 // creating URL link to the image uploaded
 $pictures .= 'http://localhost/projectExample/posts/' . $user_id . '/' . $file. " ";
 $return['pictures'] = $pictures;
 }

}//弗雷奇

//将详细信息插入到数据库中

Answer 1

我使用了您的swift代码并成功上传了图像，所以我确信是您的PHP代码出现了一些错误。请确保返回的json格式正确，如：

echo '{"code" : 200}'