PHP. Руководство по PHP. 2005

Handling of global variables Пред.

Приложение C. Migrating from PHP 3 to PHP 4

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
?>

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