PHP echo - 当没有在mySQL中输入URL时如何使按钮不显示？

Question

I want the Sign In Button to only appear on a site when a URL is entered. As is, it appears with or without URL.

<a class='button' href='<?php echo $expert['url'];?>'>Sign in</a>

I tried different ways, nothing works.

<?php if($url==1){?>
<a class='button' href='<?php echo $expert['url'];?>'>Sign in</a>
<?php }?>

What am I missing?

It seems like such as simple fix!

Answer 1

Try this:

<?php
if (empty($expert['url'])) {
echo "No URL";
 } else {
echo "<a class='button' href='$expert['url']'>Sign in</a>";
}
?>

I think what you need to use is empty.