ถามเรื่องตัวแปรแบบ global ครับในรูปแบบของฟังชั่นส์ึครับ

<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<?php
function Conn2()
{
global $num01;
}

function xxx()
{
     return $num01 = rand(1,9);
}
?>

<?
include ("FUNC.PHP");

echo xxx();
?>

1. SHOW.PHP
<?
include ("FUNC.PHP");
xxx();
echo $num01;
?>

<?php
function xxx()
{
global $num01;
$num01=rand(1,9);
}
?>

<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<?php
function game_1()
{
global $num01;
global $num02;
global $num03;
global $num04;
global $num05;
global $num06;
global $num07;
global $num08;
global $num09;
$oper1=rand(2,3);
$oper2=rand(1,9);
$num01=rand(1,9);
$num02=($num01*$oper1)+($oper2);
$num03=($num02*$oper1)+($oper2);
$num04=($num03*$oper1)+($oper2);
$num05=($num04*$oper1)+($oper2);
$num06=($num05*$oper1)+($oper2);
$num07=($num06*$oper1)+($oper2);
$num08=($num07*$oper1)+($oper2);
$num09=($num08*$oper1)+($oper2);
}
?>