Operation in an Array

How can i make an operation like adding variables in an array for example
$array[$a+$b];

Thanks
Harry

"Harry.De" <harald.mohring@gmx.de> wrote in message
news:20031214113105.50630.qmail@pb1.pair.com...
> How can i make an operation like adding variables in an array for example
> $array[$a+$b];

You'll have to be more specific. What exactly do you want to do? Add values
of an array together? Their keys?

Al