Call to undefined method mysqli_stmt::get_result()

include 'conn.php';
 $conn = new Connection();
 $query = 'SELECT EmailVerified, Blocked FROM users WHERE Email = ? AND SLA = ? AND `Password` = ?';
 $stmt = $conn->mysqli->prepare($query);
 $stmt->bind_param('sss', $_POST['EmailID'], $_POST['SLA'], $_POST['Password']);
 $stmt->execute();
 $result = $stmt->get_result();

define('SERVER', 'localhost');
 define('USER', 'root');
 define('PASS', 'xxxx');
 define('DB', 'xxxx');
 class Connection{
  /**
  * @var Resource 
  */
  var $mysqli = null;
 
  function __construct(){
  try{
  if(!$this->mysqli){
  $this->mysqli = new MySQLi(SERVER, USER, PASS, DB);
  if(!$this->mysqli)
  throw new Exception('Could not create connection using MySQLi', 'NO_CONNECTION');
  }
  }
  catch(Exception $ex){
  echo "ERROR: ".$e->getMessage();
  }
  }
 }

if(!stmt) echo 'Statement prepared'; else echo 'Statement NOT prepared';