bp_admin_repair_nickname_value()

function bp_admin_repair_nickname_value() {

	$offset = isset( $_POST['offset'] ) ? (int) ( $_POST['offset'] ) : 0;

	$args  = array(
		'number' => 50,
		'fields' => array( 'ID' ),
		'offset' => $offset,
	);
	$users = get_users( $args );

	if ( ! empty( $users ) ) {

		foreach ( $users as $user ) {
			$nickname = xprofile_get_field_data( bp_xprofile_nickname_field_id(), $user->ID );
			if ( preg_match( '/[A-Z]/', $nickname ) ) {
				xprofile_set_field_data(
					bp_xprofile_nickname_field_id(),
					bp_loggedin_user_id(),
					strtolower( $nickname )
				);
			}
			$offset++;
		}
		$records_updated = sprintf( __( '%s members updated successfully.', 'buddyboss' ), number_format_i18n( $offset ) );
		return array(
			'status'  => 'running',
			'offset'  => $offset,
			'records' => $records_updated,
		);
	} else {
		// Description of this tool, displayed to the user.
		$statement = __( 'Repair Nickname… %s', 'buddyboss' );
		$result    = __( 'Complete!', 'buddyboss' );

		// All done!
		return array(
			'status'  => 1,
			'message' => sprintf( $statement, $result ),
		);
	}

}