uninstall.php

<?php

namespace YALW;

/**
 * Clean up after uninstall
 *
 * @package YALW
 * @since 0.14
 */
class Uninstall {

	function __construct() {
		$option_name = 'yalw_option';

		delete_option( $option_name );

		// For site options in Multisite
		delete_site_option( $option_name );
	}
}

// If uninstall is not called from WordPress, exit
if ( ! defined( 'WP_UNINSTALL_PLUGIN' ) ) {
	exit();
}

new Uninstall;