public function duplicate($num_parent = 0)
 {
     global $dbh;
     if (!$num_parent) {
         $num_parent = $this->num_parent;
     }
     //on place le nouvel article à la fin par défaut
     $query = "SELECT id_article FROM cms_articles WHERE num_section=" . addslashes($num_parent);
     $result = pmb_mysql_query($query);
     if ($result) {
         $order = ",article_order = '" . (pmb_mysql_num_rows($result) + 1) . "' ";
     } else {
         $order = ",article_order = 1";
     }
     $insert = "insert into cms_articles set \n\t\tarticle_title = '" . addslashes($this->title) . "', \n\t\tarticle_resume = '" . addslashes($this->resume) . "', \n\t\tarticle_contenu = '" . addslashes($this->contenu) . "',\n\t\tarticle_logo = '" . addslashes($this->logo->data) . "',\n\t\tarticle_publication_state ='" . addslashes($this->publication_state) . "', \n\t\tarticle_start_date = '" . addslashes($this->start_date) . "', \n\t\tarticle_end_date = '" . addslashes($this->end_date) . "', \n\t\tnum_section = '" . addslashes($num_parent) . "', \n\t\tarticle_num_type = '" . $this->num_type . "',\n\t\tarticle_creation_date=sysdate() " . $order;
     pmb_mysql_query($insert, $dbh);
     $id = pmb_mysql_insert_id();
     //au tour des descripteurs...
     for ($i = 0; $i < count($this->descriptors); $i++) {
         $rqt = "insert into cms_articles_descriptors set num_article = '" . $id . "', num_noeud = '" . $this->descriptors[$i] . "',article_descriptor_order='" . $i . "'";
         pmb_mysql_query($rqt, $dbh);
     }
     //on crée la nouvelle instance
     $new_article = new cms_article($id);
     //enfin les éléments du type de contenu
     $types = new cms_editorial_types("article");
     $types->duplicate_type_form($this->num_type, $id, $this->id);
     $new_article->maj_indexation();
     $new_article->documents_linked = $this->documents_linked;
     $new_article->save_documents();
 }