Singleton.php

<?php

final class Singelton {
	
    	/**
	 * @var null|Singleton
	 */
	protected static $instance = null;
	

   	/**
	 * Singleton constructor
	 */
	private function __construct() {
        	// Yepp.
	}

	/**
	 * Get singleton instance
	 *
	 * @return Singleton
	 */
	public static function get_instance() : Singleton {
		if ( null === self::$instance ) {
			self::$instance = new self;
		}
		return self::$instance;
	}

}