maybe you lot can help me am trying to make a option were it will check 3 lots of information and enable / disable the selectioned items for the setting below is my badly coded code i tryed to work out.

<?php
 
if ($sid == '1') {
   if ($qty == '4') {
    echo "Sorry!, You are only able to order a maxium of 3 samples per order.";
 $tag = 'disabled';
 
} elseif ($_SESSION['cart']) {
 $tag = '';
 
} else {
    $tag = 'disabled';
  }
}
 
?>

basicly what i wanrt is for it to check SID and then QTY and if there both match to disable the option then i want it to check to see if the cart is true or false and if false to disable the funcation yet agen

can anyone help me plz?

thanks