public function save( $user ) {

		if ( is_numeric( $user ) ) {

			// Numeric ID is passed in during creations.
			$user   = new WP_User( $user );
			$action = 'create';

		} elseif ( isset( $user->ID ) ) {

			// An object that's not a WP_User gets passed in during updates.
			$user   = new WP_User( $user->ID );
			$action = 'update';
		}

		// Saves custom fields.
		foreach ( $this->fields as $field => $data ) {

			$value = apply_filters( 'lifterlms_save_custom_user_field_' . $field, llms_filter_input_sanitize_string( INPUT_POST, $field ), $user, $field );
			update_user_meta( $user->ID, $field, $value );

		}

		// Save instructor assistant's parent instructor.
		if ( in_array( 'instructors_assistant', $user->roles, true ) && ! empty( $_POST['llms_parent_instructors'] ) ) { // phpcs:disable WordPress.Security.NonceVerification.Missing

			$instructor = llms_get_instructor( $user );
			$instructor->add_parent( llms_filter_input( INPUT_POST, 'llms_parent_instructors', FILTER_SANITIZE_NUMBER_INT, FILTER_REQUIRE_ARRAY ) );

		}

		// Save personal options.
		if ( user_can( $user, 'edit_courses' ) && 'create' !== $action ) {
			$autosave = empty( $_POST['llms_builder_autosave'] ) ? 'no' : 'yes';
			update_user_meta( $user->ID, 'llms_builder_autosave', $autosave );
		}

	}