custom post type in code

Hi,

Could you please provide more details here? Do you need this image name change to work for product post type only or you want to change post type in addition to the image name?
In first case you cann add a conditional like this:
if ( 'product' === get_post_type( $post_id )
right after
if(is_numeric($post_id))
to select products only.

Thanks

the full code should look like this then:

function wp_modify_uploaded_file_names($image_name) {

    // Get the parent post ID, if there is one
    if( isset($_GET['post_id']) ) {
        $post_id = $_GET['post_id'];
    } elseif( isset($_POST['post_id']) ) {
        $post_id = $_POST['post_id'];
    }

    // Only do this if we got the post ID--otherwise they're probably in
    //  the media section rather than uploading an image from a post.
    if(is_numeric($post_id) && 'product' === get_post_type( $post_id ) ) {

        // Get the post slug
        $post_obj = get_post($post_id);
        $post_slug = $post_obj->post_name;

        // If we found a slug
        if($post_slug) {

            $random_number = rand(10000,99999);
            $image_name['name'] = $post_slug . '-' . $random_number . '.jpg';

        }

    }

    return $image_name;

}
add_filter('wp_handle_upload_prefilter', 'wp_modify_uploaded_file_names', 1, 1);

I checked it on my local – works as expected.

How you would handle several images for one post in this case?