resync_wordpress_xprofile_fields()

function resync_wordpress_xprofile_fields() {
	$users = get_users( [
		'fields' => [ 'ID', 'user_nicename' ]
	] );

	foreach ( $users as $user ) {
		xprofile_set_field_data( bp_xprofile_firstname_field_id(), $user->ID, get_user_meta( $user->ID, 'first_name', true ) );
		xprofile_set_field_data( bp_xprofile_lastname_field_id(), $user->ID, get_user_meta( $user->ID, 'last_name', true ) );

		// make sure nickname is valid
		$nickname = get_user_meta( $user->ID, 'nickname', true );
		$nickname = sanitize_title( $nickname );
		$invalid  = bp_xprofile_validate_nickname_value( '', bp_xprofile_nickname_field_id(), $nickname, $user->ID );

		// or use the user_nicename
		if ( ! $nickname || $invalid ) {
			$nickname = $user->user_nicename;
		}

		bp_update_user_meta( $user->ID, 'nickname', $nickname );
		xprofile_set_field_data( bp_xprofile_nickname_field_id(), $user->ID, $nickname );
	}

	$statement = __( 'Re-sync user WordPress data to BuddyBoss profile fields; %s', 'buddyboss' );

	return array( 0, sprintf( $statement, __( 'Complete!', 'buddyboss' ) ) );
}