Question on smarty and php code how to add?

Question

PHP

Hello, tell me, I’m not a programmer guru, but I don’t know smart at all, except that {php} cannot be used with 3.0 and higher, there is a product page that $product.sku comes to and there are two buttons that either send to a page with this product or to an alternative , everything would be fine, this crutch works, but if the partner does not have such a page, then he will transfer it where it is not necessary, so I thought to use something like that

<?php
$url = 'https://yandex.ru';
if(get_headers($url, 1)){
   echo 'Гуд';
}

else 

{
    
    echo 'Нет';
    
}

?>

but in smart such crutches can not be inserted

here is the code that works

{if $product.sku}{*если штрихкод есть то направляем на данный товар на wildberries 2*}
          
              		<div class="btn">
            <a href="https://www.wildberries.ru/catalog/{$product.sku}/detail.aspx?targetUrl=BP"><div class="bye_btn">
              <i class="fa fa-cart-plus" aria-hidden="true"></i>
              <span>Купить в розницу</span>
            </div></a>
          </div>
              
              {else}
              
              <div class="btn">
            <a href="https://www.wildberries.ru/brands/stella"><div class="bye_btn">
              <i class="fa fa-cart-plus" aria-hidden="true"></i>
              <span>Купить в розницу</span>
            </div></a>
          </div>
                    
        {/if}{*wildberries 2*}
              
          {/if}

Answer 1

Smarty is a template engine, these crutches have no place in it. Check everything in advance, and pass the result of this check to Smarty.