break; case 'ex3': HomeWork1::ex3(); break; case 'ex4': HomeWork1::ex4(); break; } break; case 2: switch ($_POST['action']) { case 'ex1': HomeWork2::ex1(); break; case 'ex2': HomeWork2::ex2(); break; case 'ex3': HomeWork2::ex3(); break; case 'ex4': HomeWork2::ex4(); break; } break; case 3: switch ($_POST['action']) { case 'ex1': HomeWork3::ex1(); break; }