Editing api response, where to start?

I have tried to create a new endpoint by adding this to functions.php, by passing a parameter:

function allow_compact_event( $data, $event, $request ) {
    // return compact data when _compact GET parameter exists 
    if(isset($_GET['_compact'])){
        return [
            'id'        => $data->data['id'],
            'title'     => $data->data['title']['rendered'],
            'link'      => $data->data['link'],
        ];
    }
    return $data;
}

add_filter( 'rest_prepare_event', 'allow_compact_event', 10, 3 );

However, all the data comes down instead of the id, title, link. It doesn’t seem to work.

Any ideas?

• This reply was modified 7 years, 2 months ago by matthisco.

Go with the request that returns the data you need, even if it’s more than you need. The data returned is in JSON format. Use json_decode() on the returned data. This translates the data into a PHP array so you can easily address individual elements using conventional associative array references. You’ll likely want to initially print_r() the entire array after decoding in order to learn the proper array addressing to get to the data you want. Once you know the proper addressing, the print_r() can be removed.