The global vars must be redeclared to be used in function?

[realtebo]

If i declare a variable as global at start of the script and then I use it into one function, when the function end, the global var has been modified or not?

[jdelaney]

If you change the value in a function, yes, it will modify the global by default.

You can re-declare it as local, inside a function, then it won't update the global.

example:

Global $something = 1

Test()
ConsoleWrite("outside: $somthing=" & $something & @CRLF)
Test(False)
ConsoleWrite("outside: $somthing=" & $something & @CRLF)

Func Test($bReuseGlobal = True)
    If Not $bReuseGlobal Then
        Local $something = 2
    Else
        $something = 3
    EndIf
    ConsoleWrite(@TAB & "inside: $somthing=" & $something & @CRLF)
EndFunc

Edited February 18, 2015 by jdelaney

[water]

The Global var has been modified.

Please see the help file for variables and scope.

[jdelaney]

Specifically:

By default when variables are declared using Dim or assigned in a function they have local scope unless there is a global variable of the same name (in which case the global variable is reused). This can be altered by using the Local and Global keywords to declare variables and force the scope you want.

Which I have demonstrated in my snippet.

Edited February 18, 2015 by jdelaney