diff --git a/admin/admin_cron.php b/admin/admin_cron.php
index 27ed0344..1f19a090 100644
--- a/admin/admin_cron.php
+++ b/admin/admin_cron.php
@@ -40,7 +40,7 @@
     define('BB_ROOT', './../');
     require BB_ROOT . 'common.php';
     $user->session_start();
-    redirect('admin/' . basename(__FILE__) . '?mode=list');
+    redirectToUrl('admin/' . basename(__FILE__) . '?mode=list');
 } else {
     require __DIR__ . '/pagestart.php';
 }
@@ -109,12 +109,12 @@
         if (file_exists('../triggers/cron_running')) {
             rename('../triggers/cron_running', '../triggers/cron_allowed');
         }
-        redirect('admin/' . basename(__FILE__) . '?mode=list');
+        redirectToUrl('admin/' . basename(__FILE__) . '?mode=list');
         break;
 
     case 'run':
         run_jobs($job_id);
-        redirect('admin/' . basename(__FILE__) . '?mode=list');
+        redirectToUrl('admin/' . basename(__FILE__) . '?mode=list');
         break;
 
     case 'edit':
@@ -210,7 +210,7 @@
         } elseif (($cron_action == 'disable' || $cron_action == 'enable') && $jobs) {
             toggle_active($jobs, $cron_action);
         }
-        redirect('admin/' . basename(__FILE__) . '?mode=list');
+        redirectToUrl('admin/' . basename(__FILE__) . '?mode=list');
     } elseif (validate_cron_post($_POST) == 1) {
         if ($_POST['mode'] == 'edit') {
             update_cron_job($_POST);
@@ -220,7 +220,7 @@
             bb_die('Mode error');
         }
 
-        redirect('admin/' . basename(__FILE__) . '?mode=list');
+        redirectToUrl('admin/' . basename(__FILE__) . '?mode=list');
     } else {
         bb_die(validate_cron_post($_POST));
     }
diff --git a/admin/admin_ug_auth.php b/admin/admin_ug_auth.php
index 0e13ae4a..8cff4125 100644
--- a/admin/admin_ug_auth.php
+++ b/admin/admin_ug_auth.php
@@ -202,8 +202,8 @@
     $ug_data = $this_userdata;
     $ug_data['session_logged_in'] = 1;
 
-    $u_access = auth(AUTH_ALL, AUTH_LIST_ALL, $ug_data, array(), UG_PERM_USER_ONLY);
-    $g_access = auth(AUTH_ALL, AUTH_LIST_ALL, $ug_data, array(), UG_PERM_GROUP_ONLY);
+    $u_access = auth_user(AUTH_ALL, AUTH_LIST_ALL, $ug_data, array(), UG_PERM_USER_ONLY);
+    $g_access = auth_user(AUTH_ALL, AUTH_LIST_ALL, $ug_data, array(), UG_PERM_GROUP_ONLY);
 
     foreach ($forums['c'] as $c_id => $c_data) {
         $template->assign_block_vars('c', array(
@@ -319,7 +319,7 @@
     $base_url = basename(__FILE__) . "?mode=group&g=$group_id";
 
     $ug_data = array('group_id' => $group_id);
-    $u_access = auth(AUTH_ALL, AUTH_LIST_ALL, $ug_data);
+    $u_access = auth_user(AUTH_ALL, AUTH_LIST_ALL, $ug_data);
 
     foreach ($forums['c'] as $c_id => $c_data) {
         $template->assign_block_vars('c', array(
diff --git a/admin/pagestart.php b/admin/pagestart.php
index 141816b9..41c77905 100644
--- a/admin/pagestart.php
+++ b/admin/pagestart.php
@@ -34,7 +34,7 @@
 $user->session_start();
 
 if (IS_GUEST) {
-    redirect(LOGIN_URL . '?redirect=admin/index.php');
+    redirectToUrl(LOGIN_URL . '?redirect=admin/index.php');
 }
 
 if (!IS_ADMIN) {
@@ -43,5 +43,5 @@
 
 if (!$userdata['session_admin']) {
     $redirect = url_arg($_SERVER['REQUEST_URI'], 'admin', 1);
-    redirect("login.php?redirect=$redirect");
+    redirectToUrl("login.php?redirect=$redirect");
 }
diff --git a/dl.php b/dl.php
index 3c400d9c..f38e3b47 100644
--- a/dl.php
+++ b/dl.php
@@ -146,7 +146,7 @@ function send_file_to_browser($attachment, $upload_dir)
         $forum_id = $row['forum_id'];
 
         $is_auth = array();
-        $is_auth = auth(AUTH_ALL, $forum_id, $userdata);
+        $is_auth = auth_user(AUTH_ALL, $forum_id, $userdata);
         set_die_append_msg($forum_id, $topic_id);
 
         if ($is_auth['auth_download']) {
diff --git a/dl_list.php b/dl_list.php
index 34be9934..eeeeab31 100644
--- a/dl_list.php
+++ b/dl_list.php
@@ -69,12 +69,12 @@
 
 // Check if user logged in
 if (!$userdata['session_logged_in']) {
-    redirect(LOGIN_URL . "?redirect=$redirect_type&$redirect");
+    redirectToUrl(LOGIN_URL . "?redirect=$redirect_type&$redirect");
 }
 
 // Check if user did not confirm
 if (isset($_POST['cancel']) && $_POST['cancel']) {
-    redirect("$redirect_type?$redirect");
+    redirectToUrl("$redirect_type?$redirect");
 }
 
 // Delete DL-list
@@ -86,7 +86,7 @@
             bb_die('Could not obtain forum_id for this topic');
         }
 
-        $is_auth = auth(AUTH_ALL, $row['forum_id'], $userdata);
+        $is_auth = auth_user(AUTH_ALL, $row['forum_id'], $userdata);
 
         if (!$is_auth['auth_mod']) {
             bb_die($lang['NOT_MODERATOR']);
@@ -107,7 +107,7 @@
     }
 
     clear_dl_list($topic_id);
-    redirect("$redirect_type?$redirect");
+    redirectToUrl("$redirect_type?$redirect");
 }
 
 // Update DL status
@@ -149,7 +149,7 @@
 
     DB()->query("REPLACE INTO " . BB_BT_DLSTATUS . " $new_dlstatus_sql");
 
-    redirect("$redirect_type?$redirect");
+    redirectToUrl("$redirect_type?$redirect");
 }
 
-redirect("index.php");
+redirectToUrl("index.php");
diff --git a/feed.php b/feed.php
index 3f2ad3c5..82f0689f 100644
--- a/feed.php
+++ b/feed.php
@@ -50,11 +50,11 @@
             }
         }
         if (file_exists($bb_cfg['atom']['path'] . '/f/' . $id . '.atom') && filemtime($bb_cfg['atom']['path'] . '/f/' . $id . '.atom') > $timecheck) {
-            redirect($bb_cfg['atom']['url'] . '/f/' . $id . '.atom');
+            redirectToUrl($bb_cfg['atom']['url'] . '/f/' . $id . '.atom');
         } else {
             require_once INC_DIR . '/functions_atom.php';
             if (update_forum_feed($id, $forum_data)) {
-                redirect($bb_cfg['atom']['url'] . '/f/' . $id . '.atom');
+                redirectToUrl($bb_cfg['atom']['url'] . '/f/' . $id . '.atom');
             } else {
                 bb_simple_die($lang['ATOM_NO_FORUM']);
             }
@@ -69,11 +69,11 @@
             bb_simple_die($lang['ATOM_ERROR'] . ' #3');
         }
         if (file_exists($bb_cfg['atom']['path'] . '/u/' . floor($id / 5000) . '/' . ($id % 100) . '/' . $id . '.atom') && filemtime($bb_cfg['atom']['path'] . '/u/' . floor($id / 5000) . '/' . ($id % 100) . '/' . $id . '.atom') > $timecheck) {
-            redirect($bb_cfg['atom']['url'] . '/u/' . floor($id / 5000) . '/' . ($id % 100) . '/' . $id . '.atom');
+            redirectToUrl($bb_cfg['atom']['url'] . '/u/' . floor($id / 5000) . '/' . ($id % 100) . '/' . $id . '.atom');
         } else {
             require_once INC_DIR . '/functions_atom.php';
             if (update_user_feed($id, $username)) {
-                redirect($bb_cfg['atom']['url'] . '/u/' . floor($id / 5000) . '/' . ($id % 100) . '/' . $id . '.atom');
+                redirectToUrl($bb_cfg['atom']['url'] . '/u/' . floor($id / 5000) . '/' . ($id % 100) . '/' . $id . '.atom');
             } else {
                 bb_simple_die($lang['ATOM_NO_USER']);
             }
diff --git a/group.php b/group.php
index 6b1b3abb..37f851fd 100644
--- a/group.php
+++ b/group.php
@@ -180,7 +180,7 @@ function build_group($params)
         ));
     } else {
         if (IS_ADMIN) {
-            redirect('admin/admin_groups.php');
+            redirectToUrl('admin/admin_groups.php');
         } else {
             bb_die($lang['NO_GROUPS_EXIST']);
         }
diff --git a/group_edit.php b/group_edit.php
index d0990f19..e3e358a4 100644
--- a/group_edit.php
+++ b/group_edit.php
@@ -112,5 +112,5 @@
     if ($group_id) {
         $redirect = GROUP_URL . $group_id;
     }
-    redirect($redirect);
+    redirectToUrl($redirect);
 }
diff --git a/index.php b/index.php
index c2ea192d..cf9eb3b0 100644
--- a/index.php
+++ b/index.php
@@ -93,7 +93,7 @@
 
 // Validate requested category id
 if ($viewcat && !($viewcat =& $forums['c'][$viewcat]['cat_id'])) {
-    redirect("index.php");
+    redirectToUrl("index.php");
 }
 
 // Forums
diff --git a/library/ajax/posts.php b/library/ajax/posts.php
index 733ae3d5..6bbe7b96 100644
--- a/library/ajax/posts.php
+++ b/library/ajax/posts.php
@@ -45,7 +45,7 @@
         $this->ajax_die('not post');
     }
 
-    $is_auth = auth(AUTH_ALL, $post['forum_id'], $userdata, $post);
+    $is_auth = auth_user(AUTH_ALL, $post['forum_id'], $userdata, $post);
     if ($post['topic_status'] == TOPIC_LOCKED && !$is_auth['auth_mod']) {
         $this->ajax_die($lang['TOPIC_LOCKED']);
     }
@@ -60,7 +60,7 @@
         $this->ajax_die('not post');
     }
 
-    $is_auth = auth(AUTH_ALL, $post['forum_id'], $userdata, $post);
+    $is_auth = auth_user(AUTH_ALL, $post['forum_id'], $userdata, $post);
 }
 
 if (!defined('WORD_LIST_OBTAINED')) {
@@ -172,7 +172,7 @@
 
             $this->response['html'] = bbcode2html($text);
         } else {
-            $is_auth = auth(AUTH_ALL, $post['forum_id'], $userdata, $post);
+            $is_auth = auth_user(AUTH_ALL, $post['forum_id'], $userdata, $post);
             if ($post['topic_status'] == TOPIC_LOCKED && !$is_auth['auth_mod']) {
                 $this->ajax_die($lang['TOPIC_LOCKED']);
             } elseif (!$is_auth['auth_edit']) {
diff --git a/library/ajax/view_post.php b/library/ajax/view_post.php
index bc263f81..5f7c27f2 100644
--- a/library/ajax/view_post.php
+++ b/library/ajax/view_post.php
@@ -60,7 +60,7 @@
         $this->ajax_die($lang['NEED_TO_LOGIN_FIRST']);
     }
 } elseif ($post_data['auth_read'] != AUTH_ALL) {
-    $is_auth = auth(AUTH_READ, $post_data['forum_id'], $user->data, $post_data);
+    $is_auth = auth_user(AUTH_READ, $post_data['forum_id'], $user->data, $post_data);
     if (!$is_auth['auth_read']) {
         $this->ajax_die($lang['TOPIC_POST_NOT_EXIST']);
     }
diff --git a/library/includes/functions.php b/library/includes/functions.php
index db7ef23b..7541eba0 100644
--- a/library/includes/functions.php
+++ b/library/includes/functions.php
@@ -140,7 +140,7 @@ function is_unread($ref, $topic_id = 0, $forum_id = 0)
 define('AUTH_ACL', 2);
 define('AUTH_ADMIN', 5);
 
-// forum_perm bitfields - backward compatible with auth($type)
+// forum_perm bitfields - backward compatible with auth_user($type)
 define('AUTH_ALL', 0);
 define('AUTH_VIEW', 1);
 define('AUTH_READ', 2);
@@ -259,7 +259,7 @@ function setbit(&$int, $bit_num, $on)
     forum auth levels, this will prevent the auth function having to do its own
     lookup
 */
-function auth($type, $forum_id, $ug_data, array $f_access = array(), $group_perm = UG_PERM_BOTH)
+function auth_user($type, $forum_id, $ug_data, array $f_access = array(), $group_perm = UG_PERM_BOTH)
 {
     global $lang, $bf, $datastore;
 
@@ -1402,7 +1402,7 @@ function bb_realpath($path)
 
 function login_redirect($url = '')
 {
-    redirect(LOGIN_URL . '?redirect=' . (($url) ?: (isset($_SERVER['REQUEST_URI']) ? $_SERVER['REQUEST_URI'] : '/')));
+    redirectToUrl(LOGIN_URL . '?redirect=' . (($url) ?: (isset($_SERVER['REQUEST_URI']) ? $_SERVER['REQUEST_URI'] : '/')));
 }
 
 function meta_refresh($url, $time = 5)
@@ -1412,7 +1412,7 @@ function meta_refresh($url, $time = 5)
     $template->assign_var('META', '<meta http-equiv="refresh" content="' . $time . ';url=' . $url . '" />');
 }
 
-function redirect($url)
+function redirectToUrl($url)
 {
     global $bb_cfg;
 
@@ -2133,7 +2133,7 @@ function hash_search($hash)
     $info_hash = DB()->escape(pack("H*", $hash));
 
     if ($row = DB()->fetch_row("SELECT topic_id FROM " . BB_BT_TORRENTS . " WHERE info_hash = '$info_hash'")) {
-        redirect(TOPIC_URL . $row['topic_id']);
+        redirectToUrl(TOPIC_URL . $row['topic_id']);
     } else {
         bb_die(sprintf($lang['HASH_NOT_FOUND'], $hash));
     }
diff --git a/library/includes/functions_torrent.php b/library/includes/functions_torrent.php
index 9efe1716..8907f9b5 100644
--- a/library/includes/functions_torrent.php
+++ b/library/includes/functions_torrent.php
@@ -69,7 +69,7 @@ function torrent_auth_check($forum_id, $poster_id)
         return true;
     }
 
-    $is_auth = auth(AUTH_ALL, $forum_id, $userdata);
+    $is_auth = auth_user(AUTH_ALL, $forum_id, $userdata);
 
     if ($poster_id != $userdata['user_id'] && !$is_auth['auth_mod']) {
         bb_die($lang['NOT_MODERATOR']);
diff --git a/library/includes/posting_tpl.php b/library/includes/posting_tpl.php
index 85592371..c4ff18e8 100644
--- a/library/includes/posting_tpl.php
+++ b/library/includes/posting_tpl.php
@@ -42,7 +42,7 @@
 
 if (!$f_data['forum_tpl_id'] || !$tpl_data = DB()->fetch_row($sql)) {
     if (!$edit_tpl_mode) {
-        redirect(POSTING_URL . "?mode=newtopic&f=$forum_id");
+        redirectToUrl(POSTING_URL . "?mode=newtopic&f=$forum_id");
     }
 }
 
diff --git a/library/includes/ucp/email.php b/library/includes/ucp/email.php
index ccd79861..d7c8fbc1 100644
--- a/library/includes/ucp/email.php
+++ b/library/includes/ucp/email.php
@@ -29,7 +29,7 @@
 
 // Is send through board enabled? No, return to index
 if (!$bb_cfg['board_email_form']) {
-    redirect("index.php");
+    redirectToUrl("index.php");
 }
 
 set_die_append_msg();
@@ -41,7 +41,7 @@
 }
 
 if (!$userdata['session_logged_in']) {
-    redirect(LOGIN_URL . "?redirect=profile.php&mode=email&" . POST_USERS_URL . "=$user_id");
+    redirectToUrl(LOGIN_URL . "?redirect=profile.php&mode=email&" . POST_USERS_URL . "=$user_id");
 }
 
 $errors = array();
diff --git a/library/includes/ucp/register.php b/library/includes/ucp/register.php
index cc869da6..5a37bace 100644
--- a/library/includes/ucp/register.php
+++ b/library/includes/ucp/register.php
@@ -65,7 +65,7 @@
      */
     case 'register':
         if (!$can_register) {
-            redirect('index.php');
+            redirectToUrl('index.php');
         }
 
         if (!IS_ADMIN) {
diff --git a/library/includes/ucp/viewprofile.php b/library/includes/ucp/viewprofile.php
index beac76a8..8eedc246 100644
--- a/library/includes/ucp/viewprofile.php
+++ b/library/includes/ucp/viewprofile.php
@@ -42,7 +42,7 @@
 }
 
 if (!$userdata['session_logged_in']) {
-    redirect(LOGIN_URL . "?redirect={$_SERVER['REQUEST_URI']}");
+    redirectToUrl(LOGIN_URL . "?redirect={$_SERVER['REQUEST_URI']}");
 }
 
 if (!$ranks = $datastore->get('ranks')) {
diff --git a/login.php b/login.php
index f714fcf6..9d6244ad 100644
--- a/login.php
+++ b/login.php
@@ -37,7 +37,7 @@
     if (!IS_GUEST) {
         $user->session_end();
     }
-    redirect("index.php");
+    redirectToUrl("index.php");
 }
 
 $redirect_url = "index.php";
@@ -88,7 +88,7 @@
 if (isset($_POST['login'])) {
     if (!$mod_admin_login) {
         if (!IS_GUEST) {
-            redirect('index.php');
+            redirectToUrl('index.php');
         }
         if ($login_username == '' || $login_password == '') {
             $login_errors[] = $lang['ENTER_PASSWORD'];
@@ -109,7 +109,7 @@
             if ($redirect_url == '/' . LOGIN_URL || $redirect_url == LOGIN_URL) {
                 $redirect_url = 'index.php';
             }
-            redirect($redirect_url);
+            redirectToUrl($redirect_url);
         }
 
         $login_errors[] = $lang['ERROR_LOGIN'];
@@ -142,4 +142,4 @@
     print_page('login.tpl');
 }
 
-redirect($redirect_url);
+redirectToUrl($redirect_url);
diff --git a/modcp.php b/modcp.php
index b7517d85..ba1511d9 100644
--- a/modcp.php
+++ b/modcp.php
@@ -157,11 +157,11 @@ function validate_mode_condition($request_index, $mod_action = '')
     if ($topic_id || $forum_id) {
         $redirect = ($topic_id) ? TOPIC_URL . $topic_id : FORUM_URL . $forum_id;
     }
-    redirect($redirect);
+    redirectToUrl($redirect);
 }
 
 // Start auth check
-$is_auth = auth(AUTH_ALL, $forum_id, $userdata);
+$is_auth = auth_user(AUTH_ALL, $forum_id, $userdata);
 $is_moderator = (IS_AM);
 
 if ($mode == 'ip') {
@@ -185,7 +185,7 @@ function validate_mode_condition($request_index, $mod_action = '')
 // Redirect to login page if not admin session
 if ($is_moderator && !$userdata['session_admin']) {
     $redirect = isset($_POST['redirect']) ? $_POST['redirect'] : $_SERVER['REQUEST_URI'];
-    redirect(LOGIN_URL . "?redirect=$redirect&admin=1");
+    redirectToUrl(LOGIN_URL . "?redirect=$redirect&admin=1");
 }
 
 //
diff --git a/posting.php b/posting.php
index 0410d340..88c17278 100644
--- a/posting.php
+++ b/posting.php
@@ -168,7 +168,7 @@
 
     set_die_append_msg($forum_id);
 
-    $is_auth = auth(AUTH_ALL, $forum_id, $userdata, $post_info);
+    $is_auth = auth_user(AUTH_ALL, $forum_id, $userdata, $post_info);
 
     if ($post_info['forum_status'] == FORUM_LOCKED && !$is_auth['auth_mod']) {
         bb_die($lang['FORUM_LOCKED']);
@@ -237,7 +237,7 @@
         default:
             $redirect = '';
     }
-    redirect(LOGIN_URL . "?redirect=/" . POSTING_URL . "?$redirect");
+    redirectToUrl(LOGIN_URL . "?redirect=/" . POSTING_URL . "?$redirect");
 }
 
 if ($mode == 'new_rel') {
@@ -316,7 +316,7 @@
 // Confirm deletion
 if (($delete || $mode == 'delete') && !$confirm) {
     if (isset($_POST['cancel'])) {
-        redirect(POST_URL . "$post_id#$post_id");
+        redirectToUrl(POST_URL . "$post_id#$post_id");
     }
     $hidden_fields = array(
         'p' => $post_id,
diff --git a/privmsg.php b/privmsg.php
index 48056a46..2c411305 100644
--- a/privmsg.php
+++ b/privmsg.php
@@ -82,7 +82,7 @@
 // Cancel
 //
 if ($cancel) {
-    redirect(PM_URL . "?folder=$folder");
+    redirectToUrl(PM_URL . "?folder=$folder");
 }
 
 //
@@ -171,7 +171,7 @@
     // Did the query return any data?
     //
     if (!($privmsg = DB()->sql_fetchrow($result))) {
-        redirect(PM_URL . "?folder=$folder");
+        redirectToUrl(PM_URL . "?folder=$folder");
     }
 
     $privmsg_id = $privmsg['privmsgs_id'];
@@ -758,7 +758,7 @@
             bb_die('Could not save private messages');
         }
 
-        redirect(PM_URL . "?folder=savebox");
+        redirectToUrl(PM_URL . "?folder=savebox");
     }
 } elseif ($submit || $refresh || $mode != '') {
     if (IS_USER && $submit && $mode != 'edit') {
@@ -1004,7 +1004,7 @@
             }
 
             if (!($privmsg = DB()->sql_fetchrow($result))) {
-                redirect(PM_URL . "?folder=$folder");
+                redirectToUrl(PM_URL . "?folder=$folder");
             }
 
             $privmsg_subject = $privmsg['privmsgs_subject'];
@@ -1024,7 +1024,7 @@
             }
 
             if (!($privmsg = DB()->sql_fetchrow($result))) {
-                redirect(PM_URL . "?folder=$folder");
+                redirectToUrl(PM_URL . "?folder=$folder");
             }
 
             $privmsg_subject = ((!preg_match('/^Re:/', $privmsg['privmsgs_subject'])) ? 'Re: ' : '') . $privmsg['privmsgs_subject'];
diff --git a/search.php b/search.php
index 1e1bb950..455b83c5 100644
--- a/search.php
+++ b/search.php
@@ -66,12 +66,12 @@
 	');
 
     if (IS_GUEST) {
-        redirect('index.php');
+        redirectToUrl('index.php');
     }
 
     DB()->query("UPDATE " . BB_POSTS . " SET user_post = 1 WHERE poster_id = {$user->id}");
 
-    redirect("search.php?u={$user->id}");
+    redirectToUrl("search.php?u={$user->id}");
 }
 
 //
@@ -528,7 +528,7 @@
         }
 
         if (!$SQL['WHERE']) {
-            redirect(basename(__FILE__));
+            redirectToUrl(basename(__FILE__));
         }
 
         $SQL['GROUP BY'][] = "item_id";
@@ -738,7 +738,7 @@
         }
 
         if (!$SQL['WHERE']) {
-            redirect(basename(__FILE__));
+            redirectToUrl(basename(__FILE__));
         }
 
         $SQL['GROUP BY'][] = "item_id";
@@ -852,7 +852,7 @@
     print_page('search_results.tpl');
 }
 
-redirect(basename(__FILE__));
+redirectToUrl(basename(__FILE__));
 
 // ----------------------------------------------------------- //
 // Functions
diff --git a/src/Legacy/Ajax.php b/src/Legacy/Ajax.php
index 61d92320..42756c34 100644
--- a/src/Legacy/Ajax.php
+++ b/src/Legacy/Ajax.php
@@ -261,7 +261,7 @@ public function verify_mod_rights($forum_id)
     {
         global $userdata, $lang;
 
-        $is_auth = auth(AUTH_MOD, $forum_id, $userdata);
+        $is_auth = auth_user(AUTH_MOD, $forum_id, $userdata);
 
         if (!$is_auth['auth_mod']) {
             $this->ajax_die($lang['ONLY_FOR_MOD']);
diff --git a/src/Legacy/Common/User.php b/src/Legacy/Common/User.php
index 1815be00..4a27e9ac 100644
--- a/src/Legacy/Common/User.php
+++ b/src/Legacy/Common/User.php
@@ -719,7 +719,7 @@ public function get_not_auth_forums($auth_type)
 
         $not_auth_forums = [];
         $auth_field = $auth_field_match[$auth_type];
-        $is_auth_ary = auth($auth_type, AUTH_LIST_ALL, $this->data);
+        $is_auth_ary = auth_user($auth_type, AUTH_LIST_ALL, $this->data);
 
         foreach ($is_auth_ary as $forum_id => $is_auth) {
             if (!$is_auth[$auth_field]) {
diff --git a/terms.php b/terms.php
index 45477a31..00a97fb4 100644
--- a/terms.php
+++ b/terms.php
@@ -32,7 +32,7 @@
 $user->session_start();
 
 if (!$bb_cfg['terms'] && !IS_ADMIN) {
-    redirect('index.php');
+    redirectToUrl('index.php');
 }
 
 $template->assign_vars(array(
diff --git a/viewforum.php b/viewforum.php
index 73f2b90e..8bddd14d 100644
--- a/viewforum.php
+++ b/viewforum.php
@@ -77,14 +77,14 @@
 }
 
 // Auth
-$is_auth = auth(AUTH_ALL, $forum_id, $userdata, $forum_data);
+$is_auth = auth_user(AUTH_ALL, $forum_id, $userdata, $forum_data);
 
 $moderation = (!empty($_REQUEST['mod']) && $is_auth['auth_mod']);
 
 if (!$is_auth['auth_view']) {
     if (IS_GUEST) {
         $redirect = ($start) ? "-$start" : '';
-        redirect(LOGIN_URL . "?redirect=" . FORUM_URL . $forum_id . $redirect);
+        redirectToUrl(LOGIN_URL . "?redirect=" . FORUM_URL . $forum_id . $redirect);
     }
     // The user is not authed to read this forum ...
     $message = sprintf($lang['SORRY_AUTH_VIEW'], $is_auth['auth_view_type']);
@@ -103,7 +103,7 @@
     $mod_redirect_url = LOGIN_URL . "?redirect=$redirect&admin=1";
 
     if ($moderation && !$userdata['session_admin']) {
-        redirect($mod_redirect_url);
+        redirectToUrl($mod_redirect_url);
     }
     if (isset($_REQUEST['tst']) && $_REQUEST['tst'] != -1) {
         $tor_status = (int)$_REQUEST['tst'];
@@ -273,7 +273,7 @@
 }
 // Correct $start value
 if ($start > $forum_topics) {
-    redirect(FORUM_URL . $forum_id);
+    redirectToUrl(FORUM_URL . $forum_id);
 }
 
 // Generate SORT and ORDER selects
diff --git a/viewtopic.php b/viewtopic.php
index 8a6e98dd..78df0fb5 100644
--- a/viewtopic.php
+++ b/viewtopic.php
@@ -176,13 +176,13 @@
 }
 
 // Auth check
-$is_auth = auth(AUTH_ALL, $forum_id, $userdata, $t_data);
+$is_auth = auth_user(AUTH_ALL, $forum_id, $userdata, $t_data);
 
 if (!$is_auth['auth_read']) {
     if (IS_GUEST) {
         $redirect = ($post_id) ? POST_URL . "$post_id#$post_id" : TOPIC_URL . $topic_id;
         $redirect .= ($start && !$post_id) ? "-$start" : '';
-        redirect(LOGIN_URL . "?redirect=$redirect");
+        redirectToUrl(LOGIN_URL . "?redirect=$redirect");
     }
     bb_die($lang['TOPIC_POST_NOT_EXIST']);
 }
@@ -203,7 +203,7 @@
     $mod_redirect_url = LOGIN_URL . "?redirect=$redirect&admin=1";
 
     if ($moderation && !$userdata['session_admin']) {
-        redirect($mod_redirect_url);
+        redirectToUrl($mod_redirect_url);
     }
 }
 
@@ -285,7 +285,7 @@
     } else {
         if (isset($_GET['unwatch'])) {
             if ($_GET['unwatch'] == 'topic') {
-                redirect(LOGIN_URL . "?redirect=" . TOPIC_URL . "$topic_id&unwatch=topic");
+                redirectToUrl(LOGIN_URL . "?redirect=" . TOPIC_URL . "$topic_id&unwatch=topic");
             }
         }
     }