/**
* @description: getter method which returns the CiviCRM instance and optionally
* creates one if it does not already exist. Standard CiviCRM singleton pattern.
* @return CiviCRM plugin instance
*/
public static function singleton()
{
// if it doesn't already exist...
if (!isset(self::$instance)) {
// create it
self::$instance = new CiviCRM_For_WordPress();
self::$instance->setup_instance();
}
// return existing instance
return self::$instance;
}
