Cannot retrieve $GLOBALS value

Hi guys,
Im trying to use a $GLOBALS variable as a way to access the current value of a variable from 1 file to another.

The 2 files involved are:
- menu2_sandbox_example.php
- geshi_code_iframe.php

I have defined a $GLOBALS variable in menu2_sandbox_example, and Im trying to get this current value as set in menu2_sandbox_example, available in geshi_code_iframe.php
So far, if I echo out the value in geshi_code_iframe.php, it returns nothing, so Im calling on your kind folk to please see where Im going wrong :>)

Here is the code in menu2_sandbox_example.php where im setting it:
===================================================== menu2_sandbox_example.php

$GLOBALS['current_sandbox_page'] = basename($_SERVER['PHP_SELF']);  
$GLOBALS['current_sandbox_page'] = explode('_',$GLOBALS['current_sandbox_page']);
$current_sandbox_page[2] = substr($current_sandbox_page[2],0,-4);
array_push($GLOBALS['current_sandbox_page'],"outputiframe.php");
print_r($GLOBALS['current_sandbox_page']);
$GLOBALS['current_sandbox_page'] = implode('_',$GLOBALS['current_sandbox_page']);

<iframe name="outputIframe" width="100%" height="100%" src="sandbox/<?php echo $GLOBALS['current_sandbox_page'] ?>"></iframe>

-----------------------------------
When i echo the $GLOBALS above, it gives me the correct value ----> I just want access to this same value in geshi_code_iframe.php

Here is my geshi_code_iframe.php call to it :>)===============================

 echo "the value of globals sandbox is: " . $GLOBALS['current_sandbox_page'];

 include ("../includes/geshi/geshi.php");

 // Define what file you want to look at:
 $file_name = 'menu2_sandbox_example_outputiframe.php';

------ Guys, in the above, when i echo $GLOBALS['current_sandbox_page'], no value is returned.
This is where my problem is.

Any help greatly appreciated :>)

Just wondering too guys if there is a better way for me to do this, a cleaner way than to use the globals keyword.
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