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run code in 200+ php & hhvm versions
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<?php $arr = array(7, NAN, 3); sort($arr); var_dump($arr);
based on N5hXC
Output for 7.1.10 - 7.2.0
array(3) { [0]=> float(NAN) [1]=> int(3) [2]=> int(7) }
Output for 7.0.0 - 7.1.7
array(3) { [0]=> int(7) [1]=> float(NAN) [2]=> int(3) }
Output for 5.5.0 - 5.6.28
array(3) { [0]=> int(3) [1]=> float(NAN) [2]=> int(7) }