diff --git a/plugins/custer/admin_menu_toggle.php b/plugins/custer/admin_menu_toggle.php
index bbf5e07..89eeff2 100644
--- a/plugins/custer/admin_menu_toggle.php
+++ b/plugins/custer/admin_menu_toggle.php
@@ -13,7 +13,7 @@ if (!defined('ABSPATH')) {
 
 
 function toggle_menu($menu_page_title, $menu_title, $menu_capability, $menu_slug, $menu_callback) {
-	$toggle_menu = Custer::TOGGLE_ADMIN_MENU;
+	$toggle_menu = Custer::OPTION_TOGGLE_MENU;
 
 	if (false === get_option($toggle_menu['_name'])) {
 		add_option($toggle_menu['_name'], $toggle_menu['hide']);
@@ -40,7 +40,7 @@ function toggle_menu($menu_page_title, $menu_title, $menu_capability, $menu_slug
 */
 function add_link_to_custer_plugin($links) {
 	$slug_toggle = Custer::SLUG_TOOGLE_ADMIN_MENU;
-	$toggle_menu = Custer::TOGGLE_ADMIN_MENU;
+	$toggle_menu = Custer::OPTION_TOGGLE_MENU;
 
 	$toggle = get_option($toggle_menu['_name']);
 
@@ -63,7 +63,7 @@ add_filter('plugin_action_links_custer/custer.php', __NAMESPACE__.'\add_link_to_
 */
 function toggle_custer_plugin_menu() {
 	$slug_toggle = Custer::SLUG_TOOGLE_ADMIN_MENU;
-	$toggle_menu = Custer::TOGGLE_ADMIN_MENU;
+	$toggle_menu = Custer::OPTION_TOGGLE_MENU;
 
 	global $wp;
 	$current_slug = $wp->request;
diff --git a/plugins/custer/change_id.php b/plugins/custer/change_id.php
index ee920b6..14295e5 100644
--- a/plugins/custer/change_id.php
+++ b/plugins/custer/change_id.php
@@ -17,40 +17,127 @@ if (!defined('ABSPATH')) {
 * the only option is to force the author
 * -> there is no sens in forcing the logged_in, because it's already the default
 *
-* [custer_change_id]         -> default (author)
-* [custer_change_id author]  -> author
-* [custer_change_id off]     -> reset to logged_in
+* [custer_author_id]                                    -> give current user the id of author
+* [custer_author_id set_anchor='anchor_name']           -> create anchor for author user
+* [custer_author_id anchor='anchor_name']               -> give current user the id stored in the anchor_name
+* [custer_author_id off]                                -> reset to logged_in
 *
 */
-function shortcode_change_id($options) {
+function shortcode_author_id($options) {
+	$anchor_name = '';
+	$option = '';
+	$is_set_anchor = false;
+
+
 	/*
-	* set the default value for option
-	* currently it can only be author
+	* set option value :
+	* 'off', 'author', 'set_anchor', or 'anchor'
 	*
 	*/
-	$option = 'author';
-	if (is_array($options)) {
-		$option = reset($options);
+	if (empty($options)) {
+		$option = 'author';
+	}
+	if (isset($options['set_anchor'])) {
+		$option = 'author';
+		$is_set_anchor = true;
+		$anchor_name = $options['set_anchor'];
+		if (empty($anchor_name)) {
+			return;
+		}
+		unset($options['set_anchor']);
+	}
+	if (isset($options['anchor'])) {
+		if ($is_set_anchor) {
+			return;
+		}
+		$option = 'anchor';
+		$anchor_name = $options['anchor'];
+		if (empty($anchor_name)) {
+			return;
+		}
+		unset($options['anchor']);
+	}
+	if (in_array('off', $options)) {
+		$option = 'off';
 	}
 
-	if (!is_string($option)) {
+	if (empty($option)) {
 		return;
 	}
 
 
+	/*
+	* find id according to option
+	* if option is set_anchor, it sets it and return 0
+	*
+	*/
+	$id = \CUSTER\find_id_wih_option($option, $anchor_name);
+	if ($id === 0) {
+		return;
+	}
+
+
+	/*
+	* set current user
+	*
+	*/
+	if ($is_set_anchor) {
+		\CUSTER\create_anchor($anchor_name, $id);
+	}
+	else {
+		wp_set_current_user($id);
+	}
+}
+add_shortcode('custer_author_id', __NAMESPACE__.'\shortcode_author_id');
+
+
+
+
+
+function create_anchor($anchor_name, $id) {
+	$option_anchor = Custer::OPTION_ANCHOR;
+
+	/*
+	* if needed, create the option
+	*
+	*/
+	if (false === get_option($option_anchor)) {
+		add_option($option_anchor, array());
+	}
+
+
+	/*
+	* add or update the id for the anchor name
+	*
+	*/
+	$anchors = get_option($option_anchor);
+	$anchors[$anchor_name] = $id;
+	update_option($option_anchor, $anchors);
+}
+
+
+
+/*
+* find ids according to options :
+* - author : change the current user to the author of the page or post
+* - anchor : uses the id stored in options with anchor_name
+* - off : reset current user to the id before the changes
+*
+*/
+function find_id_wih_option($option, $anchor_name) {
 	if ($option === 'author') {
 		$id = \CUSTER\get_author_id();
 		Custer::set_current_user_backup();
-		wp_set_current_user($id);
+	}
+	else if ($option === 'anchor') {
+		$id = \CUSTER\get_anchor_id($anchor_name);
+		Custer::set_current_user_backup();
 	}
 	else if ($option === 'off') {
 		$id = Custer::reset_current_user_backup();
-		wp_set_current_user($id);
 	}
-	else
-		return;
+	return $id;
 }
-add_shortcode('custer_change_id', __NAMESPACE__.'\shortcode_change_id');
 
 
 
diff --git a/plugins/custer/custer.php b/plugins/custer/custer.php
index 0e51081..7d40b3e 100644
--- a/plugins/custer/custer.php
+++ b/plugins/custer/custer.php
@@ -4,7 +4,7 @@ Plugin Name: custer_plugin
 Plugin URI:
 Description: customize user : output infos on page, on email, and change current user id momentarly
 Author: hugogogo
-Version: 0.1.1
+Version: 0.1.3
 Author URI:
 */
 
@@ -18,7 +18,7 @@ if (!defined('ABSPATH')) {
 
 
 include_once(plugin_dir_path(__FILE__) . '/custer_class.php');
-include_once(plugin_dir_path(__FILE__) . '/author_id.php');
+include_once(plugin_dir_path(__FILE__) . '/get_user_id.php');
 include_once(plugin_dir_path(__FILE__) . '/change_id.php');
 include_once(plugin_dir_path(__FILE__) . '/format_user_infos.php');
 include_once(plugin_dir_path(__FILE__) . '/user_infos.php');
diff --git a/plugins/custer/custer_class.php b/plugins/custer/custer_class.php
index 8323e31..3cf33ab 100644
--- a/plugins/custer/custer_class.php
+++ b/plugins/custer/custer_class.php
@@ -19,7 +19,8 @@ class Custer {
 	
 	const USER_INFO_DATE_FORMAT = 'd/m/Y'; // for user_infos.php (date format : https://www.php.net/manual/fr/datetime.format.php)
 	const SLUG_TOOGLE_ADMIN_MENU = ['_name'=>'toogle_admin_menu_url_custer', 'toggle'=>'toggle', 'show'=>'show', 'hide'=>'hide'];
-	const TOGGLE_ADMIN_MENU = ['_name'=>'toggle_admin_menu_option_custer', 'show'=>'show', 'hide'=>'hide'];
+	const OPTION_TOGGLE_MENU = ['_name'=>'toggle_admin_menu_option_custer', 'show'=>'show', 'hide'=>'hide'];
+	const OPTION_ANCHOR = 'custer_anchor_ids';
 
 	private static $_backup_current_user = null;
 
@@ -38,6 +39,9 @@ class Custer {
 	}
 	public static function reset_current_user_backup() {
 		$backup_user = self::$_backup_current_user;
+		if ($backup_user === null) {
+			$backup_user = get_current_user_id();
+		}
 		self::$_backup_current_user = null;
 		return $backup_user;
 	}
diff --git a/plugins/custer/filter_mail.php b/plugins/custer/filter_mail.php
index 378b779..db90223 100644
--- a/plugins/custer/filter_mail.php
+++ b/plugins/custer/filter_mail.php
@@ -57,22 +57,22 @@ function replace_words($matches, $user_id = null) {
 * filter emails in the form-builder hook, before the wp_mail hook
 * it receives the id of the user, no need to have the user still logged-in
 *
-function filter_email_fb_CIPF($reply_body, $post_array) {
-	PLGNTLS_class::debug_infos();
-	$id = $post_array['ID'];
-	// pattern : anything surrounded by '$$', ex : $$value$$
-	$pattern = '/\$\$(.*?)\$\$/';
-
-	// inline callback, with 'use' to get the id
-	$new_body = preg_replace_callback($pattern, function($matches) use ($id) {
-		return replace_words_CIPF($matches, $id);
-	}, $reply_body);
-
-	return $new_body;
-}
-add_filter('df_confirmation_body', 'filter_email_fb_CIPF', 10, 2); // the receive an email
-add_filter('df_notification_body', 'filter_email_fb_CIPF', 10, 2); // the admin receive a notification
 */
+//function filter_email_fb_CIPF($reply_body, $post_array) {
+//	PLGNTLS_class::debug_infos();
+//	$id = $post_array['ID'];
+//	// pattern : anything surrounded by '$$', ex : $$value$$
+//	$pattern = '/\$\$(.*?)\$\$/';
+//
+//	// inline callback, with 'use' to get the id
+//	$new_body = preg_replace_callback($pattern, function($matches) use ($id) {
+//		return replace_words_CIPF($matches, $id);
+//	}, $reply_body);
+//
+//	return $new_body;
+//}
+//add_filter('df_confirmation_body', __NAMESPACE__.'\filter_email_fb_CIPF', 10, 2); // the receive an email
+//add_filter('df_notification_body', __NAMESPACE__.'\filter_email_fb_CIPF', 10, 2); // the admin receive a notification
 
 
 
@@ -87,10 +87,15 @@ function filter_email_wp($args) {
 	// pattern : anything surrounded by '$$', ex : $$value$$
 	$pattern = '/\$\$(.*?)\$\$/';
 
+error_log("inside wp_mail hook, in filter_email_wp");
+
 	$old_body = $args['message'];
 	$new_body = preg_replace_callback($pattern, __NAMESPACE__.'\replace_words', $old_body);
 	$args['message'] = $new_body;
 
+error_log("args['message']");
+error_log(json_encode($args['message']));
+
 	return $args;
 }
 add_filter('wp_mail', __NAMESPACE__.'\filter_email_wp', 10, 1);
diff --git a/plugins/custer/author_id.php b/plugins/custer/get_user_id.php
similarity index 54%
rename from plugins/custer/author_id.php
rename to plugins/custer/get_user_id.php
index 4e3de3e..81d8b56 100644
--- a/plugins/custer/author_id.php
+++ b/plugins/custer/get_user_id.php
@@ -39,4 +39,37 @@ function get_author_id() {
 
 
 
+/*
+* get the anker user id
+* return 0 if not found
+*
+*/
+function get_anchor_id($anchor_name) {
+	$option_anchor = Custer::OPTION_ANCHOR;
+error_log("anchor_name:");
+error_log($anchor_name);
+
+	$anchors = get_option($option_anchor);
+error_log("anchors:");
+error_log(json_encode($anchors));
+	if ($anchors === false) {
+error_log("anchors === false");
+		return 0;
+	}
+
+	if (isset($anchors[$anchor_name])) {
+		$user_id = $anchors[$anchor_name];
+	}
+
+	if (empty($user_id)) {
+		return 0;
+	}
+
+	return $user_id;
+}
+
+
+
+
+
 ?>