I am trying to connect to mysql database with php code but it gives me this errors (see below)

I am trying to connect to mysql database with php code but it gives me this error: Warning: mysqli_connect(): (HY000/1044): Access denied for user ''@'localhost' to database 'test1' in C:\xampp\htdocs\imobiliare\server.php on line 8

Warning: mysqli_query() expects parameter 1 to be mysqli, bool given in C:\xampp\htdocs\imobiliare\server.php on line 11

Warning: mysqli_num_rows() expects parameter 1 to be mysqli_result, null given in C:\xampp\htdocs\imobiliare\server.php on line 13

$servername = "localhost";
$username = "";
$password = "";
$dbname = "test1";
$conn = mysqli_connect($servername, $username, $password, $dbname);
$sql = "SELECT id, camere, zona, pret FROM apartamente";
$result = mysqli_query($conn, $sql);
if(mysqli_num_rows($result) > 0) {
 while($row = mysqli_fetch_assoc($result)) {
  echo "id: " . $row["id"]. "Camere: " . $row["camere"]. "Zona:" .       $row["zona"]. "Pret: " . $row["pret"]."
";
 }
 }
  ?>

I would like to echo the results