/**
  * @return WPML_Dependencies
  */
 public static function get_instance()
 {
     if (null === self::$instance) {
         self::$instance = new WPML_Dependencies();
     }
     return self::$instance;
 }
 /**
  * @return WPML_Dependencies
  */
 public static function get_instance()
 {
     if (!isset(self::$instance)) {
         self::$instance = new WPML_Dependencies();
     }
     return self::$instance;
 }