I am having trouble to sign up for the php and it gives me this error Warning : mysqli_connect(): (HY000/1049): Unknown database 'lab' in C:\xampp\htdocs\lab1\new_user.php on line 8 I dont know if the...

I am having trouble to sign up for the php and it gives me this error Warning : mysqli_connect(): (HY000/1049): Unknown database 'lab' in C:\xampp\htdocs\lab1\new_user.php on line 8 I dont know if the code was different here is the code $username = "root"; $password = ""; $hostname = "localhost"; $dbname = "lab"; $selected = mysqli_connect($hostname, $username, $password, $dbname); if(isset($_POST['user']) && isset($_POST['pass'])){ $user = $_POST['user']; $pass = $_POST['pass']; $query = "SELECT * FROM users WHERE username='$user'"; $result = mysqli_query($selected, $query); if(mysqli_num_rows($result) > 0 ) { //check if there is already an entry for that username echo "Username already exists!"; }else{ $query = "INSERT INTO users (username, password) VALUES ('$user', '$pass')"; $result = mysqli_query($selected, $query); header("location:index.php"); } } mysqli_closhe($selected); ?> Signup! " method="POST"> Username: Password: