> Ten separate arrays with an array at 0 that has the data I'm after.
> This is where I'm getting stuck.  How can I get to the keys that are
> either 'mc' or 'truefalse' and sum them?

foreach my man
http://us2.php.net/foreach

foreach ($_SESSION['arans'] as $arans) {
$truefalse += $arans['truefalse'];
$mc += $arans['mc'];
}

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