PHP — Anonymous Singleton Class

anonymous-singleton.php

<?php

$singleton = get_class(
    new class
    {
        protected static $instance;
    
        public static function getInstance()
        {
            if (! isset(self::$instance)) {
                self::$instance = new self();
            }

            return self::$instance;
        }
        
        public function someMethod()
        {
            // do something   
        }
        
        public function anotherMethod()
        {
            // do something else
        }
    }
);

$singleton::getInstance()->someMethod();
$singleton::getInstance()->anotherMethod();