Alamofire POST请求PHP脚本没有值

Question

I have a problem with a POST request in Alamofire. If I try to make a POST Request, it seems that the PHP script doesn't get the values. This is my POST Request:

func userRegistration(){
    let url = "http://offlineshopper.sunpowr.de/register.php"
    let parameters: [String:String] = ["nickname":RegisterTexts.nickname, "password":RegisterTexts.password, "email":RegisterTexts.email]
    print(parameters)
    Alamofire.request(url, method: .post, parameters: parameters, encoding: JSONEncoding.default).responseJSON{ response in
        if((response.result.value) != nil){
            let swiftyJsonVar = JSON(response.result.value!)
            print("Das kommt dabei raus: \(swiftyJsonVar)")
        }
    }
}

The parameters Dictionary print this: ["nickname": "Test", "password": "Test", "email": "Test"]

So I think this is right.

This here is my PHP Script:

<?php
include("mysql_connect.php");

if(isset($_POST['nickname'])){
    $nickname = $_POST['nickname'];
}

if(isset($_POST['password'])){
    $password = $_POST['password'];
}

if(isset($_POST['email'])){
    $email = $_POST['email'];
}

//Check if nickname is already used
$select = "SELECT `nickname` FROM `User` WHERE nickname = '$nickname'";
$result = mysqli_query($link, $select);
if (!$result){
    $returnArray["message"] = "Fehler in der Datenbank!";
    json_encode($returnArray);
}
if (mysqli_num_rows($result) != 0){
    $returnArray["message"] = "Nickname bereits vorhanden!";
    json_encode($returnArray);
}

//Add new User to the database
$sql = "INSERT INTO User (nickname, password, email) VALUES ('$nickname', '$password', '$email')";
if(mysqli_query($link, $sql)){
    $returnArray["message"] = "Erfolgreich registriert!";
    echo json_encode($returnArray);
}
else{
    mysqli_error($link);
    $returnArray["message"] = "Fehler!";
    echo json_encode($returnArray);
}

mysqli_close($link)
?>

I get the response "Erfolgreich registriert" in my App so everything should work fine. I also get new datasets in my database. The problem is that only the id is set in the database, which is auto increment. The other fields are empty so the POST variables are never saved in the database.. Any ideas what I'm doing wrong here?

EDIT: It's working now, just switching

Alamofire.request(url, method: .post, parameters: parameters, encoding: JSONEncoding.default).responseJSON

with

Alamofire.request(url, method: .post, parameters: parameters, encoding: URLEncoding.httpBody).responseJSON