using 'index varaible' in for loop on varaible
===

I tried to do somthing like that:

    $cat1 = array('hello', 'everyone');
    $cat = array('bye', 'everyone');
    
    for($index = 0; $index < 2; $index++) {
    echo $cat$index[1];
    }

It doesn't work of course.
What do I need to change here?
