Update some database fields when post is saved

Question

I have a class that will count the Lines of Code, Source Lines of Code, and the Code disk space used. I would like to save these values into the database so that these values can be calculated only when a new post is saved or updated instead of running the code on every page view

So my question is, what is the best way to make sure these are added/updated everytime a new post is made and everytime that post is updated/edited.

Also where should I store these, in a custom meta field? If so, how can I make sure that the meta box does not show up on the page, it should all be done behind the scenes

Answer 1

Best way for storing them is Wordpress' Options Mechanism.

ANd best way to trigger it when a post saved is using Wordpress save_post action.

Example :

add_action( 'save_post', 'count' ); //Execute count() when a post saved/updated
function count()
{
    your codes here ...

    //save them to DB
    update_option("lines-of-code", $lines);
    update_option("disk-space", $diskspace);
    ...
}