? local arrays retain size between function calls?

#cs ----------------------------------------------------------------------------
 
 AutoIt Version: 3.3.12.0
 Author:         myName
 
 Script Function:
    Template AutoIt script.
 
#ce ----------------------------------------------------------------------------
; ?? seems like the array is not destroyed when subroutine is exited
; Script Start - Add your code below here
#include <Array.au3>
 
 
Global $sWhereAreWe = _GetDirParent(@ScriptDir) ;; "R:\Operations\MacroTools\_RejectServiceRequestsNotInError\Programs\
Global $sWhereAreWeA = _GetDirParent($sWhereAreWe) ;;"R:\Operations\MacroTools\_RejectServiceRequestsNotInError\
MsgBox (0, "", $sWhereAreWe & @cr & $sWhereAreWeA  & @CR & @ScriptDir )
 
Func _GetDirParent ($sMyDir) ; no need for input parms, we will find where we run from
 
Local $text = $sMyDir ; & "\"  ;
Local $array = StringSplit($text, '\', 1)
MsgBox (0,"text",$text)
 _ArrayDisplay($array)
 
Local $iUpperBound = $array[0]
Local $iI
Local $sParent = ""
 
For $iI = 1 To $iUpperBound -1
    $sParent = $sParent & $array[$iI] & "\"
Next
 
 MsgBox (0," ", $sParent)
Return $sParent
EndFunc
 
; Local $sS = _GetDirParent()