PHP - PDO MySQL

<?php

$hostname = 'localhost';
$username = 'root';
$password = 'indonesia';

try{
    $db = new PDO("mysql:host=$hostname;dbname=a", $username, $password);
    echo 'Connected to database';
    $db = null;
}catch(PDOException $e){
    echo $e->getMessage();
}

PHP - PDO MySQL