[resolved] If querystring exists?

[solitario]

Hello all.

<?php
switch ($_GET['lang']) {
case "es":
	$txtGreeting = array("buenas dias");
	break;
case "fr":
	$txtGreeting = array("bon jour");
	break;
default:
	$txtGreeting = array("good day");
}
?>

The above code works just fine when I click on a link such as:

<a href="index.php?lang=fr">French</a>

But if I click a link without the querystring (?lang=fr), I receive a nasty error message:

"Undefined index: lang"

Could anyone explain to me how to determine if a querystring exists BEFORE performing the switch statement?
Or, if possible, how I could switch to default if the querystring is absent?

Many thanks.

[Acidic]

put all that in an IF like this:

if (isset($_GET['lang'))
    {
    
    } 

That should check if the variable has been set at all. Find out more about the funciton here.

[solitario]

Works perfectly. Thanks, Acidic!

[The Hobo]

It's actually not an error but a notice. There is a way you can setup the php.ini to shut off notices. I have this on my remote server, but on my test server I have it turned on, just because it helps practice better coding habits.

If you're interested in finding knowing how to shut it off, let us know. I would encourage leaving it on, but I just thought I'd let you know there's the option.