wordpress plugin: query post-ID in plugin?

Question

hey guys, maybe some of you have experience with programming wordpress plugins. I have a probably rather simpel question, but i couldn\'t find anything on the web.

Answer 1

My guess is Use global keyword to access post id in function

And also my guess is return and echo both would not work together in function

function test($content) {
        global $post;
        return $post->ID.'
'.$content;
    }