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<?php $a = array( 2.0, NAN, 1.0 ); sort($a); var_dump($a);
Output for 7.1.10 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 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(3) { [0]=> float(NAN) [1]=> float(1) [2]=> float(2) }
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.7
array(3) { [0]=> float(2) [1]=> float(NAN) [2]=> float(1) }
Output for 5.5.24 - 5.5.35, 5.6.8 - 5.6.28
array(3) { [0]=> float(1) [1]=> float(NAN) [2]=> float(2) }

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