Understanding session variables with input field and register_global

[Otto Wyss <otto.wyss@xxxxxxxxxx>]

I've an input field in a form

<input name="username" type="text" ...

and with register_global I can use this field in PHP as variable 
$username. Yet if I use a session variable

$_SESSION['username'] = 'value'

the variable $username gets the same value. On the other side when I 
enter a value in the input field, the session variable isn't changed. So 
how can I set the session variable from the input field after it has 
changed?

O. Wyss

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