-// Returns an array of group id's this contact is a member of.
-// This array will only contain group id's related to the uid of this
-// DFRN contact. They are *not* neccessarily unique across the entire site.
-
-
-if(! function_exists('init_groups_visitor')) {
-function init_groups_visitor($contact_id) {
- $groups = array();
- $r = q("SELECT `gid` FROM `group_member`
- WHERE `contact-id` = %d ",
- intval($contact_id)
- );
- if(count($r)) {
- foreach($r as $rr)
- $groups[] = $rr['gid'];
- }
- return $groups;
-}}
+/**
+ * @brief Kills the "Friendica" cookie and all session data
+ */
+function nuke_session() {
+
+ new_cookie(-3600); // make sure cookie is deleted on browser close, as a security measure
+ session_unset();
+ session_destroy();
+}
+
+/**
+ * @brief Calculate the hash that is needed for the "Friendica" cookie
+ *
+ * @param array $user Record from "user" table
+ *
+ * @return string Hashed data
+ */
+function cookie_hash($user) {
+ return(hash("sha256", get_config("system", "site_prvkey").
+ $user["uprvkey"].
+ $user["password"]));
+}
+
+/**
+ * @brief Set the "Friendica" cookie
+ *
+ * @param int $time
+ * @param array $user Record from "user" table
+ */
+function new_cookie($time, $user = array()) {
+
+ if ($time != 0)
+ $time = $time + time();