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run code in 200+ php & hhvm versions
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<?php $arr = array(7, NAN,); sort($arr); print_r($arr);
based on 7FLuN
Output for 5.3.21 - 5.6.28, 7.1.10 - 7.2.0
Array ( [0] => NAN [1] => 7 )
Output for 7.0.0 - 7.1.7
Array ( [0] => 7 [1] => NAN )