$user = wp_get_current_user();
if(!empty($user)) {
 $email = $user->user_email;
 $fname = $user->user_firstname;
 $sname = $user->user_lastname;
 $url = 'https://docs.google.com/forms/d/e/1FAIpQLSeChqhovV70FbILIlfeo8K5UL9q3hfjPkngEe4IJkXMmCbawg/viewform?entry.646601418=STUDENT+01&entry.280532864='.$email.'&entry.1176284616='.$fname.'&entry.165661554='.$sname;
 echo $url;
} else {
 $email = 'info@domain.com';
 $url = 'https://docs.google.com/forms/d/e/1FAIpQLSeChqhovV70FbILIlfeo8K5UL9q3hfjPkngEe4IJkXMmCbawg/viewform?entry.646601418=STUDENT+01&entry.280532864='.$email.'&entry.1176284616=First&entry.165661554=Last';
 echo $url;
}