fix undefined variable order

src/backend/caldav/caldav.php

@@ -97,10 +97,9 @@ class BackendCalDAV extends BackendDiff {
                     $search = ldap_search($ldap_conn, CALDAV_IDENTITY_LDAP_BASE, $filter, array(CALDAV_IDENTITY_LDAP_IDENTIFIER));
                     $items = ldap_get_entries($ldap_conn, $search);
                     if ($items['count'] > 0) {
-                        $ret_value = $identity;
                         ZLog::Write(LOGLEVEL_DEBUG, sprintf("BackendIMAP->getIdentityFromLdap() - Found entry in LDAP. Generating From"));
                         // We get the first object. It's your responsability to make the query unique
-                        $caldav_path = str_replace('%i', $items[0][$field][CALDAV_IDENTITY_LDAP_IDENTIFIER], $caldav_path);
+                        $caldav_path = str_replace('%i', $items[0][CALDAV_IDENTITY_LDAP_IDENTIFIER][0], $caldav_path);
                     }
                     else {
                         ZLog::Write(LOGLEVEL_DEBUG, sprintf("BackendIMAP->getIdentityFromLdap() - No entry found in LDAP"));