Singleton facade

Kode 

/**
 * Singleton facade
 * 
 * A test in making multiple instances accessing the data repository of a
 * singleton instance, where all instances is derived from the same class. 
 */
class SingletonFacade {
	/**
	 * Singleton instance
	 * @var SingletonFacade
	 */
	private static $instance = null;
	
	/**
	 * Constructor
	 */
	public function __construct() {
		// Do what you must
	}
	
	/**
	 * Instance factory, generel method for singletons.
	 */
	private function getInstance() {
		if(!self::$instance) {
			self::$instance = $this;
		}
		return self::$instance;
	}
	
	/**
	 * Get some kind of value.
	 * 
	 * @return mixed
	 */
	public function getValue() {
		if(self::$instance !== $this) {
			return $this->getInstance()->getValue();
		}
		return $this->value;
	}
	
	/**
	 * Set some kind of value.
	 * 
	 * @param mixed
	 * @return SingletonFacade For fluent access
	 */
	public function setValue($v) {
		if(self::$instance !== $this) {
			return $this->getInstance()->setValue($v);
		}
		$this->value = $v;
		return $this;
	}
}

// Example
$test = new SingletonFacade();
$test->setValue('Rap fyr i LA');
		
$test = new SingletonFacade();
echo $test->getValue(); // output: "Rap fyr i LA"