I’m using WordPress 3.8, and i have a page with insert php plugin.
The page works correctly, when it’s called from the main site.
Inside the wordpress page there is written:
[insert_php]
require("{$_SERVER['DOCUMENT_ROOT']}/podcast_manager.php");
[/insert_php]
But when I post the link on facebook, it outputs this:
Outputting php code, instead of running it!
Really I do not know why !
What is happening is that the php code is in the body of the WordPress post/page. That creates a description (static text) that FB then reads, sort of like Facebook Open Graph.
To try to see if that is the problem, try creating a custom description by using a SEO plugin. Otherwise the PHP code is executing fine, it is just a description issue that FB reads from the header.
EDIT
View source of your post/page and see if the
<metaholds that php string in it.name="description" content="">