How to redirect PHP page on MySQL database connection failure

Using MySQLi connection method I am trying to redirect page instead of printing out the error message

<?php
define('DB_SERVER', 'localhost');
define('DB_USERNAME', 'root');
define('DB_PASSWORD', 'password');
define('DB_NAME', 'demo');
 
$mysqli = new mysqli(DB_SERVER, DB_USERNAME, DB_PASSWORD, DB_NAME);
 
// Check connection
if($mysqli === false){
    die("ERROR: Could not connect. " . $mysqli->connect_error);
    header('Location: http://www.example.com/'); 
}
?>

trying to test this out I change the localhost to localhostszzz but I am getting error message of

Warning: mysqli::__construct(): php_network_getaddresses: getaddrinfo failed: Name or service not known in /../../page.php on line 8

Instead of re-directing to http://www.example.com/, how can I fix this?

Answer

OK, This is what I was looking for and is working for me mow

  try{
      $conn = new mysqli($servername, $username, $password, $dbname);
  }
  catch(Exception $e){
    header('Location: 500.php');
    die();
}