Shortcode returning specific content of a post

Question

I'm currently building a plugin to display specific part of post after accepting verification code. Can a shortcode return a part of a post? I mean:

Bla bla bla [shortcode postID="100"] Special bla bla [/shortcode] Bla bla

How to code a function to retrieve specific content of a post only when the plugin calls this shortcode?

Answer 1

Why don't you use something like:

Bla bla bla [shortcode postID="100" content="Special bla bla"] Bla bla

and then retrieve your content in your shortcode function.

extract( shortcode_atts( array(
   'content' => '',
), $attr ) );

echo 'special content is: '.$content;