php registration do not push to db issue - php

Question

I've got 2 classes - db.class.php and user.class.php. Within second one I have 2 methods associated with registration - register and registerValidation. db file is responsible for specifying db credentials and initializing connection. I do not really want to pollute my post so I will only give you db code as a link because I don't really think that the problem lays there.
The code of register method and validation method is:
<?php
require_once 'token.php';
class User
{
//db and table name
private $conn;
private $table_name = "users";
// constructor with $db as database connection
public function __construct($db)
{
$this->conn = $db;
}
public function registerValidation($nick,$email,$password)
{
if(
(strlen($nick) < 5 || strlen($nick) > 20) ||
(strlen($email) < 3 || strlen($email) > 100) ||
(strlen($password) < 6 || strlen($password) > 50)
)
{
//$error = 'nick or email or password is wrong length';
//echo json_encode($error);
return false;
}
else
{
// query to check if email already exists
$query = "
SELECT
*
FROM
" . $this->table_name . "
WHERE
id = ?
OR
email = ?
";
// prepare query statement
$stmt = $this->conn->prepare($query);
// bind params
$stmt->bindParam(1, $nick);
$stmt->bindParam(2, $email);
// execute query
$stmt->execute();
//count if there is same
$num = $stmt->rowCount();
if ($num > 0)
{
return false;
}
else
{
return true;
}
}
}
public function register($nick,$email,$password)
{
try
{
$password = password_hash($password, PASSWORD_DEFAULT);
$query = "
INSERT INTO
users(user, user, user)
VALUES
(?, ?, ?)";
// prepare query statement
$stmt = $this->conn->prepare($query);
//bind values from user
$stmt->bindparam(1, $nick);
$stmt->bindparam(2, $email);
$stmt->bindparam(3, $password);
$stmt->execute();
return $stmt;
}
catch(PDOException $e)
{
echo $e->getMessage();
}
}
I also have file doRegister.php which is some kind of endpoint for client side:
<?php
if(isset($_POST['submit']))
{
if(!empty($_POST['nick'])
&& !empty($_POST['email'])
&& !empty($_POST['password']))
{
// instantiate database
require_once '../config/database.php';
$database = new Database();
$db = $database->getConnection();
require_once '../classes/user.php';
$user = new User($db);
if($user->registerValidation($_POST['nick'], $_POST['email'], $_POST['password']))
{
$user->register($_POST['nick'], $_POST['email'], $_POST['password']);
http_response_code(201);
}
else
{
http_response_code(400);
}
}
else
{
http_response_code(400);
}
}
else
{
http_response_code(400);
}
When I send http POST request via postman I get 201(created) but when I go to localhost/phpmyadmin after that, there is no new record inside user table in my mysql db. Why?

Answer 1

The register function is definitely returning false on execution of the insert statement. Also it looks like the columns are wrong.
$query = "
INSERT INTO
users(nick, email , password)
VALUES
(?, ?, ?)";
#before returning true or false do a check on execute()
return $stmt->execute() === true ? true : false;
Also before returning the header 201, do a check on the register function to verify that it was true and not false..