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PHP

Return 404 for Empty Category and Tag Pages

Shows your "not found" page with a 404 status for categories, tags and other terms that have no published posts, instead of an empty archive.

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Code

add_action( 'template_redirect', function () {
    global $wp_query;

    if ( ( is_category() || is_tag() || is_tax() ) && ! is_paged() && ! $wp_query->have_posts() ) {
        $wp_query->set_404();
        status_header( 404 );
        nocache_headers();
    }
}, 1 );

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