> Then the errors sometimes occur in my apache2/ssl_error_log (undefined
> index in $_SESSION variable). When I check the sess_12345789... file,
> some of the variables are missing : $_SESSION["a"] and ["b"] are there,
> but not $_SESSION["c"], even an empty one, it is just gone. That's all I
> know.

Sounds like for those situations, the user doesn't have one of the
options set (the database is returning a null value).

Check that by matching up whatever 'a' and 'b' are with what's in the
database.

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