Order ACF taxonomy terms by user's current distance from location

• prdstudio

• August 8, 2022 at 10:10 am

Hi,

I built a web app where users are workers and building sites are taxonomies, each term having a single ACF Google Maps field to save site’s latitude and longitude.
I made it possible to workers to edit their own working days entries, using acf_form() in front end, letting them choose the day’s building site from a dropdown managed by ACF taxonomy field.

Using Geolocation_API I’d like to order the dropdown list by the current user’s distance from each site, ordering building sites by the nearest to the farthest.

Because user’s location is a temporary value by definition, I’m struggling to get how to compare the ACF stored building sites coordinates values with the user’s lat+long and return a ordered by distance terms list on the front end drop down.

Using ACF taxonomy query filters I can get into the query I need, as per documentation:

add_filter('acf/fields/taxonomy/query', 'my_acf_fields_taxonomy_query', 10, 3);
function my_acf_fields_taxonomy_query( $args, $field, $post_id ) {

    // Show 40 terms per AJAX call.
    $args['number'] = 40;

    // Order by most used.
    $args['orderby'] = 'count';
    $args['order'] = 'DESC';

    return $args;
}

As long as I already have each building site latitude and longitude, and the current user’s coordinates as well, I suppose I need to use usort() function to change the OrderBy output.

Is this the right solution and could anyone suggest me the right sintax to obtain something like:

$args[‘orderby’] = “my_usort_result()”;

Thanks!

• John Huebner

• August 24, 2022 at 1:35 pm

I am not 100% sure what you are asking.

for get terms

$args['include'] = array(/* array of term IDs in the order you want them returned */);
$args['orderby'] = 'include';