No Category Parents

This plugin completely removes the mandatory ‘Category Base’ and all the parents from your
category permalinks (e.g. /category/parent-category/my-category/ becomes /my-category/).

It also shortens post permalinks when you use the /%category%/ permastruct, so a post filed
under a deeply nested category still gets a short URL.

If a post or page already uses the same slug as a category, the post keeps the clean URL and
the category is served from /my-category-cat/ instead.

1. Install and activate the plugin through the ‘Plugins’ menu in WordPress.
2. That’s it. Your categories are now reachable at http://mysite.com/my-category/

Deactivating the plugin restores the stock WordPress permalinks.

0.3.1

• Update the plugin URI to point at the plugin landing page.

0.3.0

• Compatible with WordPress 7.0 and PHP 8.
• Fixed: parent categories were only removed one level deep. A category nested two or more
  levels down (parent > child > grandchild) kept its immediate parent in the URL. Links are
  now rebuilt from the term instead of being regex-patched, so any depth works.
• Fixed: PHP 8 warnings (“Undefined array key 0”, “Attempt to read property ID on null”)
  when building permalinks.
• Fixed: the rewrite rules were flushed on every page load, rebuilding and re-saving the
  whole rule set on each request. Flushing now happens once, only after a category changes.
  Measured on a local WordPress 7.0 install: ~197 ms/request before, ~114 ms/request after.
• Added: category feeds (/my-category/feed/) now resolve.
• Changed: all functions are prefixed with ncp_. Earlier versions declared generic names
  such as filter_category() and my_flush_rules() in the global namespace, which could
  collide with a theme or another plugin.
• Changed: the category base is now forced empty through a filter instead of being written
  to the database on every request.
• Added: ncp_collision_suffix and ncp_post_link_category filters.
• Removed: leftover debug code and an unused id query var.

0.2.4.1

• Quickfix: fixed pagination bug

0.2.4

• Tested up to WP 4.1
• Fixed pagination problem (special thanks to Lukáš Wojnar).

0.2.3

• Changed some links.
• Fixed “empty category” problem (special thanks to absolutex).

0.2.2

• In 0.2.1 when the “Category Base” field wasn’t empty the plugin didn’t work. Now the
  “Category Base” field will automatically be empty when you activate the plugin.

0.2.1

• Minor changes in the comments.

0.2

• The plugin now works with the permastruct /%category%/ and also replaces the post permalinks.
• Other minor fixes.