> This is the exact same code run twice.  It works exactly the same both
> times.  Where is the silent failure?

    The second change will not have any effect.  It will be lost.
    The session module does not see it.  The module looks at
    $_SESSION first, and if it does not find anything, falls back
    to the global sym table.

    You can try it yourself by firing up PHP 4.2 and running the
    script from this test case.

    http://lxr.php.net/source/php4/ext/session/tests/008.phpt

    - Sascha


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