Setting a global PowerShell variable from a function where the global variable name is a variable passed to the function

Question

I need to set a global variable from a function and am not quite sure how to do it.

# Set variables
$global:var1
$global:var2
$global:var3

function foo ($a,         


        

Answer 1

As simple as:

$A="1"
function changeA2 () { $global:A="0"}
changeA2
$A