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<?php $arr = array(7, NAN, 3,); sort($arr); print_r($arr);
Output for 7.0.23 - 7.0.31, 7.1.9 - 7.1.23, 7.2.0 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
Array ( [0] => NAN [1] => 3 [2] => 7 )
Output for 7.0.0 - 7.0.22, 7.1.0 - 7.1.8
Array ( [0] => 7 [1] => NAN [2] => 3 )
Output for 5.5.0 - 5.5.38, 5.6.0 - 5.6.38
Array ( [0] => 3 [1] => NAN [2] => 7 )

preferences:
245.89 ms | 401 KiB | 282 Q