it is possible to post parameters for register? - swift3

Question

i try to use the URLRequest for post Parameters (user name , password ) for some website from iOS (swift language) and the operation is success and i receive message success from the web which tell me you are logged in
below it's my code :
// check the user name and password
guard let url = URL(string: "http://MyWeb/login.php")else {
displayAlertControllerForLogin(title: "Wrong URL", message: "Please Check URL")
return
}
var urlRequest = URLRequest(url: url)
urlRequest.httpMethod = "POST"
let postString = "username=\(userName)&password=\(password)"
urlRequest.httpBody = postString.data(using: String.Encoding.utf8)
let task = URLSession.shared.dataTask(with: urlRequest) {[weak self] (data, response, error) in
if error != nil {
print("have an error")
return
}// end the if error
let string = String(data: data!, encoding: .utf8)
if let string = string {
if string.contains("cel_song") {
DispatchQueue.main.async { [weak self] in
// present main view for check only
let tabBarController = MainVC()
self?.present(tabBarController, animated: true, completion: nil)
}// end the dispatch
}else{
// show the alert if the user invalid
DispatchQueue.main.async { [weak self] in
self?.displayAlertControllerForLogin(title: "Error Login!", message: "Please Check User Name / Password")
}// end the dispatch
}// end the else
}// end the if let string
}// end the task
task.resume()
now please i need to register to this web site through the post 5 parameters using URLrequest (username , full name ,email, website,password,confirmPassword) to register in that website
but the operation is failed
the below is my code for register in website using urlRequest post :
guard let url = URL(string: "http://MyWeb/register.php") else {displayAlertControllerForLogin(title: "Wrong URL", message: "Please ReWrite URL") ; return }
var urlRequest = URLRequest(url: url)
urlRequest.httpMethod = "POST"
let webSite = "google"
let postString = "username=\(userName)&fullname=\(fullName)&email=\(email)&website=\(webSite)&password=\(password)&confirmPassword=\(confirmPassword)"
urlRequest.httpBody = postString.data(using: String.Encoding.utf8)
let task = URLSession.shared.dataTask(with: urlRequest, completionHandler: {[weak self] (data, response, error) in
if let error = error {
self?.displayAlertControllerForLogin(title: "Error Issue", message: error.localizedDescription)
return
}
// fetch the data
let string = String(data: data!, encoding: .utf8)
if let string = string {
if string.contains("Registration...") {
// register faield
DispatchQueue.main.async { [weak self] in
self?.displayAlertControllerForLogin(title: "Register Faield!", message: "Some Issue Occur When Try To register!")
print(string)
return
}
}else{
// register complete
DispatchQueue.main.async { [weak self] in
self?.displayAlertControllerForLogin(title: "Register Complete!", message: "Welcome \(userName) You Are Register To Ampache Successfully!")
return
}
}// end the if string.contains
}// end the if let
})// end the task
task.resume()
my question please it's possible to register to some website using url request with post 5 parameters in swift language?