How does understanding the difference between instance and static context in object-oriented programming impact the use of Singleton classes in PHP?

Understanding the difference between instance and static context in object-oriented programming is crucial when working with Singleton classes in PHP. Singleton classes ensure that only one instance of a class is created, which can be accessed globally. By using static methods and properties, Singleton classes can be accessed without the need to instantiate the class multiple times, making them ideal for scenarios where only one instance is needed throughout the application.

class Singleton {
    private static $instance;

    private function __construct() {
        // private constructor to prevent instantiation
    }

    public static function getInstance() {
        if (!isset(self::$instance)) {
            self::$instance = new self();
        }
        return self::$instance;
    }
}

// Usage
$singletonInstance = Singleton::getInstance();