This week's book giveaway is in the OCAJP 8 forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide and have Edward Finegan & Robert Liguori on-line! See this thread for details.
The feature is called "Register Globals". In old versions of PHP what you're doing was allowed by default, but in PHP 4.2 it was disabled by default for security reasons. And in PHP5 it's officially deprecated. Don't use it .