What are some best practices for implementing Singleton classes in PHP to avoid conflicts and ensure proper data management, especially in the context of web development and database interactions?

When implementing Singleton classes in PHP for web development and database interactions, it is important to ensure that only one instance of the class exists throughout the application to avoid conflicts and ensure proper data management. To achieve this, you can use a private static variable to store the instance of the class and a private constructor to prevent external instantiation. Additionally, you can implement a getInstance() method to provide access to the single instance.

class Singleton {
    private static $instance = null;
    
    private function __construct() {
        // Private constructor to prevent external instantiation
    }
    
    public static function getInstance() {
        if (self::$instance === null) {
            self::$instance = new self();
        }
        
        return self::$instance;
    }
}