index.php
---------
<?php
        Global $myglobalvar ;
        $myglobalvar=2 ;
        Header("Location: index2.php") ;
?>
~                                                                               
~                                                                               
~                                                                               
~                                                                               
~                                                                               
~
index2.php
----------
<?php
        Global $myglobalvar ;
?>
<html>
<head>
</head>
<body>
myglobalvar=<?= $myglobalvar ?><br>
</body>
</html>