--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/program/steps/utils/killcache.inc	Thu Jan 04 15:52:31 2018 -0500
@@ -0,0 +1,55 @@
+<?php
+
+/**
+ +-----------------------------------------------------------------------+
+ | program/steps/utils/killcache.inc                                     |
+ |                                                                       |
+ | This file is part of the Roundcube Webmail client                     |
+ | Copyright (C) 2005-2010, The Roundcube Dev Team                       |
+ |                                                                       |
+ | Licensed under the GNU General Public License version 3 or            |
+ | any later version with exceptions for skins & plugins.                |
+ | See the README file for a full license statement.                     |
+ |                                                                       |
+ | PURPOSE:                                                              |
+ |   Delete rows from cache tables                                       |
+ |                                                                       |
+ +-----------------------------------------------------------------------+
+ | Author: Dennis P. Nikolaenko <dennis@nikolaenko.ru>                   |
+ +-----------------------------------------------------------------------+
+*/
+
+// don't allow public access if not in devel_mode
+if (!$RCMAIL->config->get('devel_mode')) {
+    header("HTTP/1.0 401 Access denied");
+    die("Access denied!");
+}
+
+// @TODO: transaction here (if supported by DB) would be a good thing
+$res = $RCMAIL->db->query("DELETE FROM " . $RCMAIL->db->table_name('cache', true));
+if ($err = $RCMAIL->db->is_error($res)) {
+    exit($err);
+}
+
+$res = $RCMAIL->db->query("DELETE FROM " . $RCMAIL->db->table_name('cache_shared', true));
+if ($err = $RCMAIL->db->is_error($res)) {
+    exit($err);
+}
+
+$res = $RCMAIL->db->query("DELETE FROM " . $RCMAIL->db->table_name('cache_messages', true));
+if ($err = $RCMAIL->db->is_error($res)) {
+    exit($err);
+}
+
+$res = $RCMAIL->db->query("DELETE FROM " . $RCMAIL->db->table_name('cache_index', true));
+if ($err = $RCMAIL->db->is_error($res)) {
+    exit($err);
+}
+
+$res = $RCMAIL->db->query("DELETE FROM " . $RCMAIL->db->table_name('cache_thread', true));
+if ($err = $RCMAIL->db->is_error($res)) {
+    exit($err);
+}
+
+echo "Cache cleared\n";
+exit;