Undefined index: QUERY_STRING

How can I get rid of that?

[Sinner_G]

I'm sure this is obvious and I'm missing something basic, but...

I have this function which should check whether the URL contains a query string and if so print it:

<?php
if (!is_null($_SERVER['QUERY_STRING'])) {
print ($_SERVER['QUERY_STRING']);
}
?>

Now if there IS a query string, it qorks perfectly. If there is none, though, I get a notice telling me

Undefined index: QUERY_STRING in path\to\my_page.php on line xx.

How can I get rid of that?

[justageek]

Use isset() instead.

[Sinner_G]

Works perfectly, thanks justageek.