[SOLVED] Help with undefined variable

[limitphp]

I have this notice:

Notice: Undefined variable: logout in C:\wamp\www\inc_login_script.php on line 11

 

I understand I can turn off these notices, but most of you have suggested I fix them instead.

 

Here's my code for that line:

 

//log user out
if ($logout=="yes")//***********	DESTROY SESSION, DELETE COOKIE, DELETE ENTRY
{
//code here
}

 

I guess its giving me this notice because there will be sometimes when logout doesn't have a value.  How should I fix this notice?

 

thanks

[Mark Baker]

if (isset($logout) && $logout == 'yes')

[limitphp]

if (isset($logout) && $logout == 'yes')

 

thanks