Example Singleton

gistfile1.txt

class ExampleSingleton {

  private $properties = array();
  private static $instance;

  private __construct(){}
  
  public getInstance() 
  {
    if (empty(self::$instance)) {
      self::$instance = new ExampleSingleton();
    }
    return self::$instance;
  }
  
  public function setProperty($key, $value)
  {
    $this->properties[$key] = $value;
  }
  
  public function getProperty($key) 
  {
    return $this->properties[$key];
  }
 
}