Easier way to check if an array key exists and has a value

And is compliant with E_STRICT ¦ E_ALL

[physics]

In an attempt to try to develop cleaner PHP code I'm using

error_reporting(E_ALL);

Problem is with that I can't be lazy (yes I know that's the point) and do:

if($_SESSION['foo']){
...
}

Because that returns an error like:

Notice: Undefined index: loggedin in ... line 10

The following does the trick

if ( array_key_exits('foo',$_SESSION) and $_SESSION['foo'] ) {
...
}

but I'm wondering if there's a shorter way that won't generate an error. Anyone know of one?

<correction>I had blamed E_STRICT but it's actuall E_NOTICE that generates the Notice: error, oops...</correction>

[mcavic]

if (isset($_SESSION['foo']))

I've found that that also executes faster than the equivalent array_key_exists call.

[physics]

Thanks mcavic, that seems to do the trick.