- var_dump: documentation ( source)
- array_intersect_key: documentation ( source)
- implode: documentation ( source)
- array_filter: documentation ( source)
- array_diff_key: documentation ( source)
- array_keys: documentation ( source)
<?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);