prepare($sql)) {
$stmt->bindParam(':employee_id', $_SESSION['id'], PDO::PARAM_INT);
$stmt->bindParam(':start_date', $start_date, PDO::PARAM_STR);
$stmt->bindParam(':end_date', $end_date, PDO::PARAM_STR);
$stmt->bindParam(':reason', $reason, PDO::PARAM_STR);
if ($stmt->execute()) {
$success_msg = 'Leave request submitted successfully!';
// Send email notification to Admins and HR
require_once 'mail/MailService.php';
$sql_users = "SELECT username FROM users WHERE role = 'Admin' OR role = 'HR'";
$stmt_users = db()->query($sql_users);
$recipients = $stmt_users->fetchAll(PDO::FETCH_COLUMN);
if (!empty($recipients)) {
$subject = "New Leave Request Submitted";
$body = "A new leave request has been submitted by {$_SESSION['username']}.