No problem! In that case, try this.
function acf_load_field_choices( $field ) {
// Create an empty array
$field['choices'] = array();
// Get parent categories and order by name
$categories = get_categories(
array(
'orderby' => 'name',
'hide_empty' => 0,
)
);
// Create a counter variable for the array
$i = 0;
foreach( $categories as $category ) {
// Get the top level categories
if ( $category->parent == 0 ) {
$field['choices'][$i] = $category->name;
$i++;
// Get subcategories within the parent category only
foreach ( $categories as $subcategory ) {
if ($subcategory->parent == $category->term_id) {
$field['choices'][$i] = $subcategory->name;
$i++;
}
}
$i++;
}
}
// Return the result
return $field;
}
add_filter('acf/load_field/name=test', 'acf_load_field_choices');
