link logo in posts to the category

Hi there,

I’m not sure I understand what you mean.

Are you trying to make the site header logo’s link point to the category of the current post for ALL the posts throughout the site?

If yes, for posts that have multiple categories, how do you determine the category to be used for linking? Or are all post using 1 category only?

Let us know.

yes
I will make all the posts with only one category

Try adding this PHP snippet:

add_filter( 'generate_logo_href', function( $href ) {
    $post_category = get_the_category( get_the_ID() );

    if( is_single() ){
        $current_post_cat_link = get_term_link( $post_category[0]->term_id, $post_category[0]->taxonomy );
        return $current_post_cat_link;
    } else { 
		return $href; 
	}

} );