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@ 2013-12-10T15:14:07Z

<?php

$regions = [
    'int' => 1,
    'nl' => 2,
    'be' => 4,
    'us' => 8,
    'as' => 16,
    'za' => 32,
];

foreach ($regions as $region => $x)
    for ($i = $x; end($regions) * 2 - $i > 0; ++$i%$x?:$i+=$x)
        if (isset($list[$region]))
            $list[$region] .= ",$i";
        else
            $list[$region] = $i;

var_dump($list);

Output
Performance
VLD
References
Branches

var_dump: documentation ( source)
end: documentation ( source)

preferences:dark modelive preview

35.46 ms | 403 KiB | 5 Q