Use post excerpt as caption?

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Is it possible to insert the “post excerpt” in the caption?

I’m currently using a method from a contributer and it works great:

$tags	= get_the_tags($ID);
 $tagged = '';
 if ( $tags ) {
 foreach ( $tags as $tag ) { $tagged[] = rawurlencode($tag->name); }
 $tagged = implode('#',$tagged);
 }
 $caption = get_the_title($ID)."\n".home_url('?p='.$ID)."\n#".$tagged;     // caption

I’m wondering if it would be possible to add the “post excerpt” as well? Thanks in advance.