/**
  * This function takes a single serialized variable and converts it back a code
  * @param string $serialized
  * @return void
  */
 function unSerializeInstance($serialized)
 {
     if (self::$instance == NULL) {
         self::$instance = new PMPluginRegistry();
     }
     $instance = unserialize($serialized);
     self::$instance = $instance;
 }