Is it possible to remove a conditional value from wordpress custom metabox

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Here i have attached the screenshot from Mysql for easy understanding.

  • In this meta value a: denotes total no of users liked the post.
  • User denotes user with id user-id
  • My question :

    Is it possible to remove a user for example if my user id is 6 i need to remove “user-6”;i:6; when user id 6 is removed.

    and also if possible to reduce total count a: if possible.

    Thank you for helping in advance..

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