Sllghtly modifed so it should now work
$inc_page = isset($_GET['page']) ? $_GET['page'] : 'blurb';
$inc_page = '_' . $inc_page . '.php';
if( ! file_exists( $inc_page ) )
$inc_page = '_blurb.php'; // default $inc_page
The $inc_page gets the $_GET['page'] variable.
index.php?page=name OR index.php?page=fname OR index.php?page=age
The $inc_page is tested to see if it exists. If it does then the $inc_page is included ELSE '_blurb.php' is included.
A blurb is a short summary accompanying a creative work; the word was coined in 1907 by American humorist Gelett Burgess. It may refer to the text on the back of a book but can also be seen on DVD and video cases, web portals and news websites. A blurb may introduce a newspaper or magazine feature story.