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<?php
session_start();
class databaseConnection {
    protected $db_name = "url";
    protected $db_user = "root";
    protected $db_pass = "";
    protected $db_host = "localhost";

    public function __construct() {
        try {
            parent::__construct("mysql:host={$this->db_host};dbname={$this->db_name}", $this->db_user, $this->db_pass);
        } catch (PDOException $e) {
            echo $e->getMessage();
        }
    }
}

$db = new databaseConnection();

$query = $db->prepare('SELECT * FROM users');
$db->execute();
print('Jurgen, je kan niks! Hier zijn al je users:');
$results = $db->fetchAll();
print_r($results);
?>