在wordpress中检查特定变量是否有值

Question

我想在div之前检查变量值，以便if变量为空时隐藏if条件中的div，反之亦然。

e.g：

<?php $var=has_post_thumbnail();
if(!empty($var)){ ?>
<div>//some code that is shown only if var has some value</div>
<?php } ?>

Answer 1

<?php if(isset($var)) // or check for empty if you want that way{ ?>
    <div> yes variable is set </div>
<?php } else { ?>
    <div> variable not set division </div>
<?php } ?>