R::count( 'users', ' `name` = ? ', [ $_POST['name'] ] )

if ( trim($_POST['name']) == '' ) {
  echo "Введите ник!";
} else if ( R::count( 'users', ' `name` = ? ', [ $_POST['name'] ] ) > 0) {
  echo "Имя занято!";
} else if ( trim($_POST['email']) == '' ) {
  echo "Введите e-mail!";
} else if ( trim($_POST['password']) == '' ) {
  echo "Введите пароль!";
} else if ( $_POST['password'] !== $_POST['cpassword'] ) {
  echo "Пароли не совпадают!";
} else {
  $user = R::dispense('users');
  $user->name = $_POST['name'];
  $user->email = $_POST['email'];
  $user->password = md5(md5($_POST['password']));
  $user->message = $_POST['message'];
  $user->date = date('d-m-Y, H:i');
  $complete = R::store( $user );
  echo $complete;
}