Snippet to add ACF taxonomy depth rules for subcategories

acf-taxonomy-depth.php

<?php

//ADD RULE TO SECTION
add_filter('acf/location/rule_types', 'acf_location_rules_types');
function acf_location_rules_types( $choices )
{
    $choices['Other']['taxonomy_depth'] = 'Taxonomy Depth';
    return $choices;
}

//MATCHING OPERATORS
add_filter('acf/location/rule_operators', 'acf_location_rules_operators');
function acf_location_rules_operators( $choices )
{
    //BY DEFAULT WE HAVE == AND !=
    $choices['<'] = 'is less than';
    $choices['>'] = 'is greater than';

    return $choices;
}

//POPULATE LIST WITH OPTIONS
add_filter('acf/location/rule_values/taxonomy_depth', 'acf_location_rules_values_taxonomy_depth');
function acf_location_rules_values_taxonomy_depth( $choices )
{

    for ($i=0; $i < 6; $i++)
    {
        $choices[$i] = $i;
    }

    return $choices;
}

//MATCH THE RULE
add_filter('acf/location/rule_match/taxonomy_depth', 'acf_location_rules_match_taxonomy_depth', 10, 3);
function acf_location_rules_match_taxonomy_depth( $match, $rule, $options )
{
    $depth = (int) $rule['value'];

    if(isset($_GET['page']) && $_GET['page'] == "shopp-categories" && isset($_GET['id']))
    {
        $term_depth = (int) count(get_ancestors($_GET['id'], 'shopp_category'));
    }
    elseif(isset($_GET['taxonomy']) && isset($_GET['tag_ID']))
    {
        $term_depth = (int) count(get_ancestors($_GET['tag_ID'], $_GET['taxonomy']));
    }

    if($rule['operator'] == "==")
    {
        $match = ($term_depth == $depth);
    }
    elseif($rule['operator'] == "!=")
    {
        $match = ($term_depth != $depth);
    }
    elseif($rule['operator'] == "<")
    {
        $match = ($term_depth < $depth);
    }
    elseif($rule['operator'] == ">")
    {
        $match = ($term_depth > $depth);
    }

    return $match;
}

?>