<select class="form-control" multiple="" name="gun[]" required="">
                            <option value="1">Pazartesi</option>
                            <option value="2">Salı</option>
                            <option value="3">Çarşamba</option>
                            <option value="4">Perşembe</option>
                            <option value="5">Cuma</option>
                            <option value="6">Cumartesi</option>
                            <option value="7">Pazar</option>
                        </select>