WP_REST_Request::get_url_params(): array

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   marcelo2605 4 years ago

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   Return a custom field with featured the image html and set image size based on URL params:

   add_action( 'rest_api_init', function() {
       register_rest_field( 'post', 'featured_image', array(
           'get_callback' => 'wporg_get_rest_featured_image',
       ) );
   } );
   
   function wporg_get_rest_featured_image( $object, $attr, $request ) {
   	$image_size = $request->get_url_params( 'id' ) ? 'full' : 'thumbnail';
   	return get_the_post_thumbnail( $object['id'], $image_size );
   }