https://blog.faceutil.com/2020/07/06/wordpress-plugin-%ec%b7%a8%ec%95%bd%ec%a0%90-like-dislike-counter-2-%ed%8c%a8%ec%8a%a4%ec%9b%8c%eb%93%9c-%ed%81%ac%eb%9e%99-%ef%bc%a0/