摘录中的php wordpress短代码

Question

I am looking for away to use shortcodes in post excerpts that will be called via:

 $post_object->post_excerpt;

I have the function set up to pull the excerpts but I am struggling to pull the shortcode. at the moment it just returns a string EG: "[short]foo[/short]". Does anyone know what I need to add to functions.php to allow shortcode usage in this way? WP 3.6

EDIT: Also the call to the excerpt is nested inside an already existing shortcode function, which works fine.

Edit 2:

To clarify, I am using 2 function. One to create a format for the page "box":

//create box shortcode
function box( $atts, $content = null) {
    $p_id = $atts['post'];
    $p = get_post($p_id);
    $output = '<div class="box"><a href="'.get_permalink($p_id).'"><div class="box_inner"><h1>'.$p->post_title.'</h1><p>'.$p->post_excerpt.'</p></div></a></div>';
    return $output; 
} 
add_shortcode("box", "box");

And one to create an icon "char" (this is the function I want to use on the excerpt in the short code above):

//big text for icons shortcode
function icon( $atts, $content = null) {
 return '<p style="text-align: center; font-size: 100px;>'.$content.'</p>';
}
 add_shortcode("icon", "icon"); 

I may be way off base here, is it even possible to use shortcodes in this fashion? and if so how do I stop the excerpt from ignoring the shortcode format?

Answer 1

For anyone who is looking.

I made a school boy error here. I had the filter:

add_filter( 'post_excerpt', 'do_shortcode');

But forgot to use:

apply_filters('post_excerpt', $p->post_excerpt);

Now works fine :-)