Handling of global variables

- While handling of global variables had the focus on to be easy in

PHP 3 and early versions of PHP 4, the focus has changed to be more

secure. While in PHP 3 the following example worked fine, in PHP 4 it

has to be unset(unset($GLOBALS["id"]));. This is

only one issue of global

variable handling. You should always have used $GLOBALS, with

newer versions of PHP 4 you are forced to do so in most cases.

Read more on this subject in the - global references section.

Пример C-1. Migration of global variables
<?php $id = 1; function test() { global $id; unset($id); } test(); echo($id); // This will print out 1 in PHP 4 ?>

Migrating from PHP/FI 2 to PHP 3 22222