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$counter = new counter();
foreach($attrs as $i=>$attribute)
{
        $values = array();
        foreach($attribute['values'] as $value)
        {
                $values[] = $value['value'];
        }
        $wheel = new wheel($attribute['attribute'], $values);
        $counter->addWheel($wheel);
}
$result = array();
do
{
        $result[] = $counter->getCombination();
}
while($counter->getFirstWheel()->wheelShift());

var_dump($result);