Question

there are some code as this:

    <div class="test">
        <div class="upsell-tags"> 
     <?php echo $this->getChildHtml('product_additional_data') ?>
     <?php echo $this->getChildHtml('upsell_products') ?>
        </div>
    </div>

i want to add a if condition before the <div class="test">. how do i do? thank you.
when i add the following code, it shows me an error,. why?

<?php if(isset($this->getChildHtml('upsell_products'))):?>.....


    <?php endif;?>

Answer 1

From the PHP docs:

Warning

isset() only works with variables as passing anything else will result in a parse error. For checking if constants are set use the defined() function.

You’re passing the return value of a function, which isn’t a valid use. You’ll need to do something like

$upsell = $this->getChildHtml('upsell_products');
if($upsell) {
    // ...
}