/**
  * 
  * get excerpt from post id
  */
 public static function getExcerptById($postID, $limit = 55)
 {
     $post = get_post($postID);
     $excerpt = $post->post_excerpt;
     $excerpt = trim($excerpt);
     $excerpt = trim($excerpt);
     if (empty($excerpt)) {
         $excerpt = $post->post_content;
     }
     $excerpt = strip_tags($excerpt, "<b><br><br/><i><strong><small>");
     $excerpt = UniteFunctionsRev::getTextIntro($excerpt, $limit);
     return $excerpt;
 }