get the current page id inside wordpress plugin page

Question

I need to get the current page id in WordPress plugin page outside the loop. And the code I wrote for getting current page id is in my plugin page.

Answer 1

Chosen answer is working only if you put it in the Wordpress loop. Outside it will render useless.

This is working everywhere:

global $wp_query;
$postID = $wp_query->post->ID;