I'm looking for a solution similar to here, except I want to keep attachment pages for attachments in a specific category.

I tried adding the below function, but it's still redirecting all of them:

add_action( 'template_redirect', 'test_attachment_redirect', 10 );
function test_attachment_redirect() {
    if( is_attachment() && !is_category('keep')) {
        $url = wp_get_attachment_url( get_queried_object_id() );
        wp_redirect( $url, 301 );

For context, my attachments do have categories with this function:

function add_categories_to_attachments() {
    register_taxonomy_for_object_type( 'category', 'attachment' );
add_action( 'init' , 'add_categories_to_attachments' );
  • attachments don't have categories, it is the posts they're attached to that have the category, for this reason testing the attachment ID for the presence of a category, or using functions that operate on the main loop such as is_category will never work for this. Also keeping in mind that an attachment can appear in a post in that category, but not be attached, since attachments can be used in multiple places, but can only have 1 parent post. What's the problem that doing this solves for you? Perhaps there are alternatives that can be suggested you are unaware of
    – Tom J Nowell
    Commented May 6, 2023 at 18:41
  • Thanks, I edited my question to give a little more context
    – BlueHelmet
    Commented May 6, 2023 at 19:22

1 Answer 1


The problem is that is_category does not do what you thought it does. is_category( 'keep' ) tests that the current page is a category archive for the category keep, it does not check if the current attachment/post is in the keep category.

The official WordPress developers docs for is_category start with:

Determines whether the query is for an existing category archive page.


Instead, what you want is to check if the current post has a category assigned, aka has_category:

has_category( string|int|array $category = '', int|WP_Post $post = null ): bool

Checks if the current post has any of given category.


  • has_category worked, thanks!
    – BlueHelmet
    Commented May 7, 2023 at 16:12

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