Simple PDO connection to a database

<?php
    $dsn = 'mysql:host=localhost;dbname=MyShop';
    $username = 'root';
    $password = 'root';

/*
 //Option 1 - without using an error page
        try {
        $db = new PDO($dsn, $username, $password);
    } catch (PDOException $e) {
        echo $e->getMessage();
        exit();
    }   
 */
    
 /*   
  //Option 1 - with an error page
        try {
        $db = new PDO($dsn, $username, $password);
    } catch (PDOException $e) {
        $error_message = $e->getMessage();
        include('database_error.php');
        exit();
    }   
 */
?>