PHP Singleton Example

gistfile1.txt

class My_Class {

	/**
	 * Our single My_Class instance.
	 *
	 * @var My_Class
	 */
	private static $instance;

	/**
	 * Disable instantiation.
	 */
	private function __construct() {
		// Private to disable instantiation.
	}

	/**
	 * Disable the cloning of this class.
	 *
	 * @return void
	 */
	final public function __clone() {
		throw new Exception( 'You\'re doing things wrong.' );
	}

	/**
	 * Disable the wakeup of this class.
	 *
	 * @return void
	 */
	final public function __wakeup() {
		throw new Exception( 'You\'re doing things wrong.' );
	}

	/**
	 * Create or retrieve the instance of My_Class.
	 *
	 * @return My_Class
	 */
	public static function getInstance() {
		if ( is_null( static::$instance ) ) {
			static::$instance = new My_Class;
			static::$instance->sample_method();
		}

		return static::$instance;
	}

	/**
	 * Sample method.
	 *
	 * @return void
	 */
	public function sample_method() {
		// do things.
	}

}
My_Class::getInstance();