Рич

<input id="check" name="check" type="hidden" value="secretcode" />

if ($form['check'] != 'secretcode') exit('Spam detected');

<input id="check" name="check" type="hidden" value="" />

         <div class="col-lg-5 col-lg-offset-3 text-right">
			<input type="submit" value="Отправить" class="btn btn-danger" onclick="document.getElementById('check').value = 'secretcode';" />
		</div>

if ($form['check'] != 'secretcode') exit('Spam detected');

<input  onclick="document.getElementById('checkspam').value='332122';" type="submit" value="Отправить" class="btn btn-danger"/>

if ($form['checkspam']!='332122') {exit('!Spam detected');}

$sql = "INSERT INTO cms_shop_orders (secret_key, date_created, date_payment, date_closed,
                                             customer_name, customer_org, customer_phone, customer_email,
                                             customer_address, customer_comment, customer_inn, items, d_type, d_price,
                                             giftcode, status, summ, user_id, city)
				VALUES ('{$order['secret_key']}', NOW(), NULL, NULL,
                        '{$order['customer_name']}', '{$order['customer_org']}', '{$order['customer_phone']}', '{$order['customer_email']}',
                        '{$order['customer_address']}', '{$order['customer_comment']}', '{$order['customer_inn']}', '{$order['items']}', '{$order['d_type']}', '{$order['d_price']}',
                        '{$order['giftcode']}', '{$order['status']}', '{$order['summ']}', '{$order['user_id']}', '{$order['city']}')";

 
<input type='radio' name='cityName' value='val1'><span>1</span>
<input type='radio' name='cityName' value='val2'><span>2</span>
 

 
<?php
if (isset($_POST['cityName']))
{
echo '<p>';
if ($_POST['cityName']==="1") echo "<b>Значение 1</b>";
if ($_POST['cityName']==="1") echo "<b>Значение 2</b>";
echo '</p>';
}
else echo '<p>не указан</p>';
?>