php - storing value returned by a prepared statement

php - storing value returned by a prepared statement

$query= "SELECT pass FROM USER WHERE email= ?;";
if($stmt= $this->con->prepare($query))
{ $stmt->bind_param('s', $un);
$stmt->execute();
$stmt->bind_result($db_hash);
}
the query would return 'pass'. How can i Store pass into a variable?
Like $abc = 'pass';