WordPress at a glance
function is not described

wp_register_user_personal_data_exporter() WP 4.9.6

Registers the personal data exporter for users.

No Hooks.

Return

Array. An array of personal data exporters.

Usage

wp_register_user_personal_data_exporter( $exporters );
$exporters(array) (required)
An array of personal data exporters.

Code of wp register user personal data exporter: wp-includes/user.php VER 5.0.3

<?php
function wp_register_user_personal_data_exporter( $exporters ) {
	$exporters['wordpress-user'] = array(
		'exporter_friendly_name' => __( 'WordPress User' ),
		'callback'               => 'wp_user_personal_data_exporter',
	);

	return $exporters;
}