function si_project_website($id = 0)
 {
     if (!$id) {
         global $post;
         $id = $post->ID;
     }
     echo apply_filters('si_project_website', si_get_project_website($id), $id);
 }
 function si_project_website($id = 0)
 {
     if (!$id) {
         $id = get_the_ID();
     }
     echo apply_filters('si_project_website', si_get_project_website($id), $id);
 }