Whmcs / Smarty if else or
{if {$product.pid==3} OR {$product.pid==4}}
<div onclick="window.location='/cart.php?a=add&pid=3'" class="col-md-6 linux_kutu ani b_sag"> <span class="beyaz_kutu oval60" style="padding:6px 10px 6px 10px"><i class="fa fa-linux siyah"></i></span> Sipariş Ver </div>
<div onclick="window.location='/cart.php?a=add&pid=4'" class="col-md-6 windows_kutu ani b_sag"> <span class="beyaz_kutu oval60" style="padding:6px 10px 6px 10px"><i class="fa fa-windows mavi"></i></span> Sipariş Ver </div>
{/if}
{if $name eq 'Fred'}
Welcome Sir.
{elseif $name eq 'Wilma'}
Welcome Ma'am.
{else}
Welcome, whatever you are.
{/if}