how can a function process all available variables?

ola! i'm trying to create a simple script to close running applications after that shutdown, the code is already working fine, i would like to make it simpler, minimize repetition in the code, i'm thinking of a function that would reuse the available variables.

code sample: 

;processes 
$firefox = "firefox.exe" 
$chrome = "chrome.exe" 

Func zz()
  If ProcessExists($firefox) then 
     ProcessClose($firefox) 
  EndIf
  If ProcessExists($chrome) then 
     ProcessClose($chrome) 
  EndIf 
EndFunc 

If @OSArch = "X86" Then 
     zz() 
     Sleep(1000) 
     Shutdown(1) 
     Exit 
EndIf 

what i would like is to have func zz() process all the variables, i will just to pass a single variable to func zz(), but this single variable is the culmination of all available variables, i like to make this work so that i would just add new apps easily and it will be processed

new code sample:

;processes 
$firefox = "firefox.exe" 
$chrome = "chrome.exe"
$programs = all available variable here 

Func zz()
  If ProcessExists($programs) then 
     ProcessClose($programs) 
  EndIf
EndFunc 

If @OSArch = "X86" Then 
     zz() 
     Sleep(1000) 
     Shutdown(1) 
     Exit 
EndIf 

TIA