I wrote the following script in PHP in order to signup the user in a MySQL table.
<?php
$host = "127.0.0.1";
$user = "root";
$password = "";
$database = "login_db";
$connessione = new mysqli($host,$user,$password,$database);
if ($connessione === false) {
    die("errore connessione db " .$connessione->connection_error);
}
    @$staff = $_POST['staff_ID'];
    @$password = $_POST['password'];
    @$email = $_POST['email'];
    @$cpt = $_POST['isCPT'];
    @$name = $_POST['Name'];
    echo $staff;
$sql = "INSERT INTO users(staff_ID, password , email, isCPT, Name) VALUES (?,?,?,?,?)";
if ($statment = $connessione->prepare($sql)){
    $statment -> bind_param("sssss",$staff,$password,$email,$cpt,$name); 
    $statment -> execute();
    $json_array = [
        "successSignUp"=>true
    ];
    header('Content-type:application/json;charset=utf-8');
    $json = json_encode($json_array);
     if ($json === false) {
        $json = json_encode(["jsonError" => json_last_error_msg()]);
        if ($json === false) {
            // This should not happen, but we go all the way now:
            $json = '{"jsonError":"unknown"}';
        }
        http_response_code(500);
     } else {
        echo $json;
     }
} else {
    echo "errore connessione";
}
$statment -> close();
$connessione -> close();
?>
using xcode i want to signin the user but i cant understand why i can't print out the json i received from the server .
for testing in the code below i'm try with Alamofire and swiftyjson to get the JSON from the server.
what i'm doing wrong ? is my php file or my alamorequest is wrong?
 
let parm : [String: Any] = ["staff_ID": staffID,"password":password, "email":email, "isCPT":isCpt, "Name": nameUser]
AF.request(self.linkServerDB, method: .post, parameters: parm).validate()
.responseJSON{ response in
 print(response)
 let json = JSON(response.result)
 print(json)
 }
 .responseData { dt in
    do {
   let json = try JSON(data: dt.data!)
   print(json)
   }catch {
   print("error")
  }
 }
