PhpDig does not have an option combo to just return the META description, but if you leave your options as posted, you can try the following untested code edit.
In robot_function.php find:
PHP Code:
$first_words = $titre_resume."\n".$page_desc['content'].$db_some_text;
and replace with:
PHP Code:
$first_words = $titre_resume."\n".$page_desc['content'];
or replace with:
PHP Code:
$first_words = $page_desc['content']."\n";