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run code in 150+ php & hhvm versions
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<?php $offset = 18000; $zone = sprintf("%+05d", $offset / 60); var_dump($zone, $offset);
based on AVotE
Output for 4.3.5 - 7.1.0
string(5) "+0300" int(18000)
Output for 4.3.0 - 4.3.4
string(5) "0+300" int(18000)