What are some best practices for implementing a ticket reservation system in PHP?

When implementing a ticket reservation system in PHP, it is important to ensure that the system is secure, user-friendly, and efficient. Best practices include validating user input, implementing proper error handling, and using a database to store and manage ticket information.

// Validate user input
if(isset($_POST['submit'])){
    $ticket_quantity = $_POST['ticket_quantity'];
    $ticket_type = $_POST['ticket_type'];
    
    // Perform validation on ticket quantity and type
    // Insert reservation into database
}

// Implement proper error handling
try {
    // Database connection code
    // Insert reservation into database
} catch (Exception $e) {
    // Handle database connection errors
}

// Use a database to store and manage ticket information
// Sample code to insert reservation into a MySQL database
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "ticket_system";

$conn = new mysqli($servername, $username, $password, $dbname);

if ($conn->connect_error) {
    die("Connection failed: " . $conn->connect_error);
}

$sql = "INSERT INTO reservations (ticket_quantity, ticket_type) VALUES ('$ticket_quantity', '$ticket_type')";

if ($conn->query($sql) === TRUE) {
    echo "Reservation successfully added.";
} else {
    echo "Error: " . $sql . "<br>" . $conn->error;
}

$conn->close();