How to get post ID in post_updated action hook?

You should be able to get the ID of the post through the $_POST variable.

EDIT: Maybe you should try doing this on the save_post action, like so, but save_post sometimes runs on other instances (ie. Autosave Drafts), so you’ll want to do some more verifying. save_post will also return the ID as one of the function arguments so you already have that handy.

add_action('save_post', 'myfunction');

function myfunction( $id ) {

    // verify if this is an auto save routine. 
    // If it is our form has not been submitted, so we dont want to do anything
    if ( defined( 'DOING_AUTOSAVE' ) && DOING_AUTOSAVE ) 
        return;

    // check if this is a page
    if ( 'page' == $_POST['post_type'] ) {

        // Return nothing if the user can't edit this page
        if ( !current_user_can( 'edit_page', $id ) )
            return;

        // do stuff here, we have verified this is a page and you can edit it

    }

}

Just tested this on localhost, works good for me.

Used a bit of code from here and you should read up on the save_post action if you decide to try this out!

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