PHP 7.0 Singleton

Singleton.php

<?php

namespace MyNamespace\MySubnameSpace;

class MySingleton
{
    private static $instance;

    public static function get_instance(): MySingleton
    {
        if (static::$instance === null) {
            static::$instance = new static();
        }

        return static::$instance;
    }

    private function __construct()
    {
    }

    private function __clone()
    {
    }
    
    public function __wakeup()
    {
        throw new \Exception("Cannot unserialize singleton");
    }
}