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<?php $profileSubscriptions = ['one' => false, 'two' => true, 'three'=>true]; $lookup = ['one' => 'subscription', 'two' => 'marketing']; $subscriptions = array_filter($profileSubscriptions); $lists = array_intersect_key($lookup, $subscriptions); $diff = array_diff_key($subscriptions, $lists); echo 'Subscriptions do not exist for ' . implode(', ', array_keys($diff)); var_dump($lists);

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