<?php $regions = [ 'int' => 1, 'nl' => 2, 'be' => 4, 'us' => 8, 'as' => 16, 'za' => 32, 'lu' => 64, 'de' => 128, 'fr' => 256, ]; foreach ($regions as $region => $x) for ($list[$region] = $i = $x; end($regions) * 2 - (++$i % $x ? $i : $i += $x) > 0; $list[$region] .= ",$i"); var_dump($list);
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