* @param    array  $post_ids     selected post ids
	 * @return   null
	 * @since    3.3.0
	 * @version  3.24.0
	 */
	public function handle_bulk_actions( $redirect_to, $doaction, $post_ids ) {

		// Ensure it's our custom action.
		if ( 'llms_export' !== $doaction ) {
			return $redirect_to;
		}

		$data = array(
			'_generator' => 'LifterLMS/BulkCourseExporter',
			'_source'    => get_site_url(),
			'_version'   => llms()->version,
			'courses'    => array(),
		);

		foreach ( $post_ids as $post_id ) {

			$c                 = new LLMS_Course( $post_id );
			$data['courses'][] = $c->toArray();

		}

		$title = str_replace( ' ', '-', __( 'courses export', 'lifterlms' ) );
		$title = preg_replace( '/[^a-zA-Z0-9-]/', '', $title );

		$filename = apply_filters( 'llms_bulk_export_courses_filename', $title . '_' . current_time( 'Ymd' ), $this );

		header( 'Content-type: application/json' );
		header( 'Content-Disposition: attachment; filename="' . $filename . '.json"' );
		header( 'Pragma: no-cache' );
		header( 'Expires: 0' );