WP_REST_Posts_Controller::handle_featured_media() WordPress Method

The WP_REST_Posts_Controller::handle_featured_media() method is responsible for handling the setting of a post's featured image via the WordPress REST API. This method accepts an array of data containing the post ID and the image ID to be set as the featured image. The method then updates the post in the WordPress database with the new featured image.

WP_REST_Posts_Controller::handle_featured_media( int $featured_media, int $post_id ) #

	protected function handle_featured_media( $featured_media, $post_id ) {

		$featured_media = (int) $featured_media;
		if ( $featured_media ) {
			$result = set_post_thumbnail( $post_id, $featured_media );
			if ( $result ) {
				return true;
			} else {
				return new WP_Error(
					'rest_invalid_featured_media',
					__( 'Invalid featured media ID.' ),
					array( 'status' => 400 )
				);
			}
		} else {
			return delete_post_thumbnail( $post_id );
		}

	}