Could someone help me in my code it appears that WWW is obsolete and that I have to use UnityWebReques

public IEnumerator CO_Createuser(string user, string email, string pass, string repass, Action<Response> response)
{
    WWWForm form = new WWWForm();
    form.AddField("user", user);
    form.AddField("email", email);
    form.AddField("pass", pass);
    form.AddField("repass", repass);
    WWW w = new WWW("http://localhost:80/Game/createuser.php", form);
    yield return w;
    Debug.Log(w.text);
    response(JsonUtility.FromJson<Response>(w.text));
}

I tried this but it didn't work either

UnityWebRequestweb = UnityWebRequest.Get("http://localhost:8080/webServicePlataformaDigital/Login.php"+"?alias="+u+"&&password="+p);

First of all, yes, WWW is obsolete and should not be used anymore.

Then from the documentation you can see that WWW if used with a second parameter - like you do

> WWW w = new WWW("http://localhost:80/Game/createuser.php", form);

implicitly uses a POST request

> The WWW class will use GET by default and POST if you supply a postData parameter.

However - besides the fact that between these two you are using completely different parameters/fields - you have been trying using a GET request with URL embedded fields.

> UnityWebRequestweb = UnityWebRequest.Get("http://localhost:8080/webServicePlataformaDigital/Login.php"+"?alias="+u+"&&password="+p);

and even worse - including a password in the URL for everyone to read

What you rather want to do is using a POST request via UnityWebRequest.Post doing e.g.

var form = new WWWForm();
form.AddField("user", user);
form.AddField("email", email);
form.AddField("pass", pass);
form.AddField("repass", repass);

using(var request = new UnityWebRequest("http://localhost:80/Game/createuser.php", form))
{
    yield return request.SendWebRequest();

    if (request != UnityWebRequest.Result.Success)
    {
        Debug.LogError(request.error);
    }
    else
    {
        Debug.Log("Form upload complete!");
        response(JsonUtility.FromJson<Response>(request.downloadHandler.text));
    }
}