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run code in 200+ php & hhvm versions
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<?php $array = [ '1' => '2017-07-01', '2' => '2017-07-05', '3' => null, ]; var_dump(asort($array));
Output for 5.6.0 - 5.6.30, hhvm-3.15.4, 7.0.0 - 7.2.0
bool(true)