prepare("INSERT INTO channels (channel_identifier) VALUES (:channel_identifier)"); $stmt->execute([':channel_identifier' => $channel_identifier]); session_start(); $_SESSION['flash_message'] = "Channel '{$channel_identifier}' added successfully!"; header("Location: index.php"); exit; } catch (PDOException $e) { if ($e->errorInfo[1] == 1062) { // Duplicate entry $error = "Error: Channel '{$channel_identifier}' already exists."; } else { $error = "Database error: " . $e->getMessage(); } } } } require_once __DIR__ . '/layout_header.php'; ?>