media categories mix with posts’ categories

Hi as described in the faq

By default the WordPress Media Library uses the same categories as WordPress does (such as in posts & pages). If you want to use separate categories for the WordPress Media Library add this code to the file functions.php located in your theme or child-theme:

/**
* separate media categories from post categories
* use a custom category called 'category_media' for the categories in the media library
*/
add_filter( 'wpmediacategory_taxonomy', function(){ return 'category_media'; } ); //requires PHP 5.3 or newer

Or if you have an older PHP version:
add_filter( 'wpmediacategory_taxonomy', create_function( '' 'return "category_media";' ) ); //requires PHP 4.0.1 or newer

• This reply was modified 6 years, 9 months ago by jeffrey-wp.

I don’t think this solution actually works. The media categories are still listed in the posts’ categories screen.

…it just creates conflict with categories/tags/archive pages.

You first have to remove the assigned categories to the media items before you activate the filter. Otherwise the categories remain assigned (but just not visible).
You can temporary remove the filter, then with bulk actions remove all asigned categories. And after that add the filter.

Still not working as separate for me. I deactivated the snippet (for PHP v 7.2) and selected all the items in the media library and bulk removed all categories. Then I ran garbage collection and WP database optimize.

Both Media and Post Category pages continued to show the same items, which were all originally post categories. I deleted one of them in the Media Category screen to see if it was a separate duplicate, but it was also deleted from the Post list. Added it back in the Post list, and it is there in the Media list again.

I also tried deactivating and uninstalling the Media Library Categories plug-in, and putting it back, and toggling the snippet activation.