From a8bfe46c686ec8dc2c34c588ba381f098058d273 Mon Sep 17 00:00:00 2001
From: Peter Cowburn <pcowburn@akamai.com>
Date: Mon, 11 Mar 2019 14:02:42 +0000
Subject: [PATCH] Redirect from inactive languages to EN (doc bug #77637)

---
 error.php | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/error.php b/error.php
index adefef13ea..2743865a56 100644
--- a/error.php
+++ b/error.php
@@ -635,6 +635,17 @@
     }
 }
 
+// ============================================================================
+// For manual pages for inactive languages, if the EN page exists, redirect there
+if (preg_match("!^manual/([^/]+)/([^/]+).php$!", $URI, $match) &&
+    isset($INACTIVE_ONLINE_LANGUAGES[$match[1]])) {
+    $try = find_manual_page("en", $match[2]);
+    if ($try) {
+        status_header(301);
+        mirror_redirect($try);
+        exit;
+    }
+}
 
 // ============================================================================
 // 404 page for manual pages (eg. not built language)