I have a function that is hooked to the end all posts. I’m adding a shortcode so the same function can be called else where. And I need to change the output method based on whether the function was called by a shortcode or the hook.

I have this:

if (did_action('hd_related_posts') > 0) {
    // Function was called by the 'hd_related_posts_shortcode' shortcode
    return ob_get_clean();
} else {
    echo" Function was not called by the shortcode";
      echo ob_get_clean();
}

But even when I call the function from the shortcode, this IF statement returns false and the output is echoed when it should be returned. How do I fix this?