[Resolved] How do I check if a variable has been linked?

[HalfLife]

Let's say the address is: /page.php
And in page.php there's this code:

if ($_GET['action'] == "browse"){...

Then it gives me an error which states that $action couldn't be found.
How do I check if $action exists?

[pjleonhardt]

if(isset($GET['action']) && $GET['action'] == browse)
{

}

[weekender]

or use the [man]array_key_exists[/man] function

array_key_exists("action", $_GET)

[HalfLife]

I'm doing this:

if (isset($_GET['action'])){
...
} else {
...
}

And it gives me this error:
Notice: Undefined index: action in C:\BigApache\Apache\htdocs\emblem\submissions.php on line 64

[HalfLife]

Nevermind, the second one (array_key_exists("action", $_GET)) works.