query("UPDATE students SET blackboard=blackboard+1 WHERE mnumber=" . trim($_POST['mnumber']));
block("lightgreen", "added blackboard");
}
if ($db->query("SELECT COUNT(*) FROM students")->fetch(PDO::FETCH_NUM)[0] == 0) {
block("red", "no students registered");
exit;
}
block("black", "add blackboard");
?>
query("SELECT firstname, lastname, mnumber, blackboard FROM students");
print "
";
while ($student = $result->fetch(PDO::FETCH_ASSOC)) {
print "