===== variavel global =====
[[http://stackoverflow.com/questions/9045445/auto-prepened-php-file-using-htaccess-relative-to-htaccess-file]]
<file php php.ini>
register_globals = On
</file>
<file php .htaccess>
php_value auto_prepend_file "./globals.php"
</file>

==== criando a biblioteca ====
[[http://stackoverflow.com/questions/16706098/enable-register-globals-in-php-5-4]]
<file php globals.php>
foreach ($_REQUEST as $key=>$val) {
    ${$key}=$val;
}
</file>

==== teste variavel global ====
[[http://php.net/manual/pt_BR/language.variables.scope.php]]
<file php teste.php>
<?php
$a = 1;
$b = 2;

function Soma()
{
    global $a, $b;

    $b = $a + $b;
}

Soma();
echo $b;
?>
</file>