merhaba bu kodu kullana bilirsiniz.
<?php if ( $this -> customer -> isLogged ()) { ?>
<a onclick="addToCart(' <?php echo $product [ 'product_id' ]; ?> ');" class="button"><span> <?php echo $button_cart ; ?> </span></a> <?php } ?>
yada bunu
<?php if (!$this->customer->isLogged()) { ?>
<a href="<?php echo $contact; ?>"> Buraya ne istiyorsan yazabirsiniz </a>
<?php } else { ?>
<a onclick="addToWishList('<?php echo $product['product_id']; ?>');"><?php echo $button_wishlist; ?></a>
<?php } ?>
Kaynak : http://forum.opencart.com/viewtopic.php?t=46767
kolay gelsin