ArticleImage::getImageArticleIndex PHP Method

    public function getImageArticleIndex()
    {
        return $this->m_data['Number'];
    }

 /**
  * Returns the index of the current image inside the article.
  * If the image doesn't belong to the article returns null.
  *
  * @return int
  */
 protected function getImageIndex() {
     $image = CampTemplate::singleton()->context()->image;
     if (!$image->defined) {
         return null;
     }
     $articleImage = new ArticleImage($this->m_dbObject->getArticleNumber(),
     $image->number);
     if (!$articleImage->exists()) {
         return null;
     }
     return $articleImage->getImageArticleIndex();
 }