<?php
// db.php
session_start();
$host = "localhost";
$dbname = "billsieu_dichvu";
$username = "billsieu_dichvu";
$password = "billsieu_dichvu"; 

try {
    $conn = new PDO("mysql:host=$host;dbname=$dbname;charset=utf8", $username, $password);
    $conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
} catch(PDOException $e) {
    die("Kết nối thất bại: " . $e->getMessage());
}
?>