SignUp rest service is not working when rest call is made from Android Application

I create project in android studio and use Volley for signup and login

I can login in my android app with email and password that i insert in database with phpMyadmin But signup in android doesn't insert email and password to database!

this is my LoginDialog.java code :

<!-- begin snippet: js hide: false console: true babel: false -->

<!-- language: lang-js -->

public class LoginDialog extends DialogFragment {
EditText edtEmail, edtPass;
Button btnSignup, btnLogin;
OnSignupClicked onSignupClicked;
View view;
@NonNull
@Override
public Dialog onCreateDialog(@Nullable Bundle savedInstanceState) {
AlertDialog.Builder builder = new AlertDialog.Builder(getContext());
view = LayoutInflater.from(getContext()).inflate(R.layout.login_dialog, null);
setupViews();
builder.setView(view);
return builder.create();
}
private void setupViews() {
btnSignup = (Button) view.findViewById(R.id.btn_loginDialog_signup);
edtEmail = (EditText) view.findViewById(R.id.edt_loginDialog_email);
edtPass = (EditText) view.findViewById(R.id.edt_loginDialog_pass);
btnLogin = (Button) view.findViewById(R.id.btn_loginDialog_login);
btnSignup.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
String email = edtEmail.getText().toString();
String pass = edtPass.getText().toString();
userSignup(email, pass);
}
});
btnLogin.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
login(edtEmail.getText().toString(), edtPass.getText().toString());
}
});
}
private void login(final String myEmail, final String pass) {
String url = "http://192.168.1.101/login.php";
StringRequest stringRequest = new StringRequest(Request.Method.POST, url, new Response.Listener<String>() {
@Override
public void onResponse(String response) {
if (response.equals("not found")) {
Toast.makeText(getContext(), "پست الکترونیک یا رمز عبور اشتباه است", Toast.LENGTH_SHORT).show();
} else {
onSignupClicked.onClicked(response);
dismiss();
}
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
Log.i("LOG", "onErrorResponse: " + error.toString());
}
}) {
@Override
protected Map<String, String> getParams() throws AuthFailureError {
Map<String, String> params = new HashMap<>();
params.put("email", myEmail);
params.put("pass", pass);
return params;
}
};
RequestQueue requestQueue = Volley.newRequestQueue(getContext());
requestQueue.add(stringRequest);
}
public void setOnSignupClicked(OnSignupClicked onSignupClicked) {
this.onSignupClicked = onSignupClicked;
}
private void userSignup(final String email, final String pass) {
String url = "http://192.168.1.101/signup.php";
StringRequest stringRequest = new StringRequest(Request.Method.POST, url, new Response.Listener<String>() {
@Override
public void onResponse(String response) {
Log.i("LOG", "onResponse: "+response);
onSignupClicked.onClicked(response);
dismiss();
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
Log.i("LOG", "onErrorResponse: " + error.toString());
}
}) {
@Override
protected Map<String, String> getParams() throws AuthFailureError {
Map<String, String> params = new HashMap<>();
params.put("email", email);
params.put("pass", pass);
return params;
}
};
RequestQueue requestQueue = Volley.newRequestQueue(getContext());
requestQueue.add(stringRequest);
}
public interface OnSignupClicked {
void onClicked(String email);
}
}

<!-- end snippet -->

And this my signup.php code :

<!-- begin snippet: js hide: false console: true babel: false -->

<!-- language: lang-html -->

<?php
include "connect.php";
$email = $_POST["email"];
$pass = $_POST["pass"];
$query = "INSERT INTO user(email,pass)VALUES (:email,:pass)";
$res=$connect->prepare($query);
$res->bindParam(":email",$email);
$res->bindParam(":pass",$pass);
$res->execute();
if($res){
echo $email;
}else{
echo "error";
}

<!-- end snippet -->

Please guide me how can i fix signup to connect with database :X

Your server side code had bugs. I fixed it

<?php
$connection = mysqli_connect('localhost','root','password','user') or die('connecition err');
$email = $_POST['email'];
$pass = $_POST['pass'];
$sql = "INSERT INTO `user` (`email`,`pass`) VALUES ('$email','$pass')";
$query = mysqli_query($connection,$sql);
if($query){
echo $email;
}else{
echo "no";
}
?>