add_action and save_post questions

  • Hi .

    I need some help with add_action function .

    I want, when a post will be submitted/updated to run a query .
    I used add_action(‘save_post’,’my_function);
    Everything is almost fine, the problem is that save_post parameter run this query 3-4 times . How can I limit this to run my query only once, when the post is saved or updated ?

    That was the first question .
    Second is, it’s possible in my query to insert the ID of the post which will be created or updated ?

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