From e33e2269837c386b32e7a6a4035f5fca6abb070c Mon Sep 17 00:00:00 2001
From: NIU Administrator <cbs-is@ml.riken.jp>
Date: Fri, 15 Jan 2021 18:40:21 +0900
Subject: [PATCH] fixed category pagination.

---
 functions.php | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/functions.php b/functions.php
index 80dff9e..347f67c 100644
--- a/functions.php
+++ b/functions.php
@@ -204,6 +204,23 @@ function cbsonline_category_year_link($url, $year)
 
     return $url;
 }
+add_filter('request', 'cbsonline_fix_category_pagination');
+function cbsonline_fix_category_pagination($query = [])
+{
+    if (isset($query['category_name']) && isset($query['page'])) {
+        if (preg_match('/^(?:category\/)?(.+)\/page$/', $query['category_name'], $matches)) {
+            $query['category_name'] = $matches[1];
+        }
+        $query['category_name'] .= $query['page'];
+        unset($query['page']);
+        if (isset($query['p'])) {
+            $query['paged'] = $query['p'];
+            unset($query['p']);
+        }
+    }
+
+    return $query;
+}
 
 // support tag cloud for static pages
 add_action('init', 'cbsonline_add_tag_to_page');