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@ 2014-07-15T14:30:58Z

<?php

$host = 'host.dupa.com';

$parts = explode('.', $host, -3);

echo $parts[-1] .'.'. $parts[-2];

Output
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References
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explode: documentation ( source)

preferences:dark modelive preview

43.43 ms | 402 KiB | 5 Q