Following two of the most important recent changes that affect old code are:

The deprecation of the old $HTTP_*_VARS arrays (which need to be indicated as global when used inside a function or met The following superglobal arrays were introduced in PHP » 4.1.0. They are: $_GET, $_POST, $_COOKIE, $_SERVER, $_FILES, $_ENV, $_REQUEST, and $_SESSION.The older $HTTP_*_VARS arrays, such as $HTTP_POST_VARS, still exist as they have since PHP 3. As of PHP 5.0.0, the long PHP predefined variable arrays may be disabled with the register_long_arrays directive.

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