Paying attention to this line:
> Also if I use !isset it returns true with a null value for $theme
Well this is clear in the manual:
isset() will return FALSE if testing a variable that has been set to NULL
So !isset($a_Null) = !FALSE = TRUE
>From PHP Manual
=============
$var = 0;
if (empty($var)) { // evaluates true
echo '$var is either 0 or not set at all';
}
if (!isset($var)) { // evaluates false
echo '$var is not set at all';
}
Read manual: empty() and isset()
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