Only if selected country display custom field

Code: Select all

<?php if ($country['country_id'] == 100) { ?>
          <div class="form-group required">
          custom_zone_code
          custom_city_code
     <?php } else { ?>
          <div class="form-group required">
            <label class="col-sm-2 control-label" for="input-zone"><?php echo $entry_zone; ?></label>
            <div class="col-sm-10">
              <select name="zone_id" id="input-zone" class="form-control">
              </select>
              <?php if ($error_zone) { ?>
              <div class="text-danger"><?php echo $error_zone; ?></div>
              <?php } ?>
            </div>
          </div>
          <div class="form-group required">
            <label class="col-sm-2 control-label" for="input-city"><?php echo $entry_city; ?></label>
            <div class="col-sm-10">
              <input type="text" name="city" value="<?php echo $city; ?>" placeholder="<?php echo $entry_city; ?>" id="input-city" class="form-control" />
              <?php if ($error_city) { ?>
              <div class="text-danger"><?php echo $error_city; ?></div>
              <?php } ?>
            </div>
          </div>
<?php } ?>