2

I am using the filter "wp_insert_post_data" to decide what to save to the database. I need to know which category has been picked before saving the post.

How can I get to know the category that has been picked while using that filter? Is there a $_POST["category"] like variable or category object accessible at this phase?

4

Yes, and you're quite close to it. Just use the $postarr parameter of this filter:

add_filter( 'wp_insert_post_data' , 'wpse128138_wp_insert_post_data', 99, 2 );
function wpse128138_wp_insert_post_data( $data, $postarr ) {

    // run this only for posts
    if ( 'post' != $postarr['post_type'] )
        return $data;

    foreach( $postarr['post_category'] as $category_id ) {
        if ( is_wp_error( $category = get_category( $category_id ) ) )
            continue; // invalid category, just pass

        // and here you can safely use the $category object
    }

    return $data;
}

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.