How can PHP developers optimize their code to prevent multiple database connections and ensure seamless user experience when working with dynamic data selections in web applications?

To prevent multiple database connections and ensure a seamless user experience when working with dynamic data selections in web applications, PHP developers can utilize connection pooling. Connection pooling allows for reusing existing database connections instead of creating a new connection each time a query is executed, reducing the overhead associated with establishing new connections. This optimization technique can improve performance and scalability of web applications.

// Create a database connection class with connection pooling
class Database {
    private static $connection;

    public static function getConnection() {
        if (!self::$connection) {
            self::$connection = new PDO('mysql:host=localhost;dbname=mydatabase', 'username', 'password');
        }
        return self::$connection;
    }
}

// Example usage
$pdo = Database::getConnection();
$stmt = $pdo->prepare('SELECT * FROM users WHERE id = :id');
$stmt->execute(['id' => 1]);
$user = $stmt->fetch();