MySQL — загрузить изображение быстро через php на сервер

Я следовал за учебником онлайн, чтобы загрузить изображение на сервер из swift. Я использовал его пример интерфейса, и все выглядит нормально, за исключением того, что я получаю сообщение об ошибке «Сообщение»: «Извините, при загрузке файла произошла ошибка», «Статус»: Ошибка, «ИД пользователя»: «9». Мои коды

<?php
$firstName = $_POST["firstName"];
$lastName = $_POST["lastName"];
$userId = $_POST["userId"];

$target_dir = "percyteng.com/orbit/ios/image";if(!file_exists($target_dir))
{
mkdir($target_dir, 0777, true);
}

$target_dir = $target_dir . "/" . $_FILES["file"]["name"];
echo json_encode( $target_dir);

if (move_uploaded_file($_FILES["file"]["tmp_name"], $target_dir)) {
echo json_encode([
"Message" => "The file ". basename( $_FILES["file"]["name"]). " has been uploaded.",
"Status" => "OK",
"userId" => $_REQUEST["userId"]
]);
} else {

echo json_encode([
"Message" => "Sorry, there was an error uploading your file.",
"Status" => "Error",
"userId" => $_REQUEST["userId"]
]);

}
?>

Я проверил, и параметры были переданы от Swift.
Вот мой код в Swift.

    import UIKit

class ViewController: UIViewController, UIPickerViewDelegate, UIImagePickerControllerDelegate, UINavigationControllerDelegate{@IBOutlet weak var image: UIImageView!
@IBOutlet weak var myActivityIndicator: UIActivityIndicatorView!

override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?) {
self.view.endEditing(true)
}

@IBAction func selectImage(sender: AnyObject) {
let ImagePicker = UIImagePickerController()
ImagePicker.delegate = self
ImagePicker.sourceType = UIImagePickerControllerSourceType.PhotoLibrary

self.presentViewController(ImagePicker, animated: true, completion: nil)
}
func imagePickerController(picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : AnyObject]) {

image.image = info[UIImagePickerControllerOriginalImage] as? UIImage
self.dismissViewControllerAnimated(true, completion: nil)

}
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.

}

@IBAction func Upload(sender: AnyObject) {
myImageUploadRequest()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
func myImageUploadRequest()
{

let myUrl = NSURL(string: "http://www.percyteng.com/orbit/ios/try.php");
//let myUrl = NSURL(string: "http://www.boredwear.com/utils/postImage.php");

let request = NSMutableURLRequest(URL:myUrl!);
request.HTTPMethod = "POST";

let param = [
"firstName"  : "Sergey",
"lastName"    : "Kargopolov",
"userId"    : "9"]

let boundary = generateBoundaryString()

request.setValue("multipart/form-data; boundary=\(boundary)", forHTTPHeaderField: "Content-Type")let imageData = UIImageJPEGRepresentation(image.image!, 1)

if(imageData==nil)  { return; }

request.HTTPBody = createBodyWithParameters(param, filePathKey: "file", imageDataKey: imageData!, boundary: boundary)let task = NSURLSession.sharedSession().dataTaskWithRequest(request) {
data, response, error in

if error != nil {
print("error=\(error)")
return
}

// You can print out response object
print("******* response = \(response)")

// Print out reponse body
let responseString = NSString(data: data!, encoding: NSUTF8StringEncoding)
print("****** response data = \(responseString!)")

do {
if let jsonResult = try NSJSONSerialization.JSONObjectWithData(data!, options: []) as? NSDictionary {
print(jsonResult)
}
} catch let error as NSError {
print(error.localizedDescription)
}dispatch_async(dispatch_get_main_queue(),{
//                self.myActivityIndicator.stopAnimating()
self.image.image = nil;
});

/*
if let parseJSON = json {
var firstNameValue = parseJSON["firstName"] as? String
println("firstNameValue: \(firstNameValue)")
}
*/

}

task.resume()

}func createBodyWithParameters(parameters: [String: String]?, filePathKey: String?, imageDataKey: NSData, boundary: String) -> NSData {
var body = NSMutableData();

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

let filename = "user-profile.jpg"
let mimetype = "image/jpg"
body.appendString("--\(boundary)\r\n")
body.appendString("Content-Disposition: form-data; name=\"\(filePathKey!)\"; filename=\"\(filename)\"\r\n")
body.appendString("Content-Type: \(mimetype)\r\n\r\n")
body.appendData(imageDataKey)
body.appendString("\r\n")body.appendString("--\(boundary)--\r\n")

return body
}func generateBoundaryString() -> String {
return "Boundary-\(NSUUID().UUIDString)"}}extension NSMutableData {

func appendString(string: String) {
let data = string.dataUsingEncoding(NSUTF8StringEncoding, allowLossyConversion: true)
appendData(data!)
}
}