Changing before storing

Question

In WordPress, I want to change something in the post content before it gets stored in the database... How would I make WordPress send the content to my custom function before storing it in the database and then receive the modified content back to finally store it?

Answer 1

I think you want content_save_pre.

Answer 2

Filter functions do exactly what you are describing. The filter that runs prior to saving content to the database is content_save_pre

function make_all_caps($content){
    return strtoupper($content);
}

add_filter('content_save_pre','make_all_caps');

Add the above to your funtions.php file, or include in a plugin and it will run right before the post content is saved to the db.