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<?php $a = [1,2,3,4,5,6,1,2,3,4,5,6]; $f = function($a,$b) { return $a <=> $b; }; uasort($a, $f); print_r($a);
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
Array ( [0] => 1 [6] => 1 [1] => 2 [7] => 2 [2] => 3 [8] => 3 [3] => 4 [9] => 4 [4] => 5 [10] => 5 [5] => 6 [11] => 6 )
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33
Array ( [6] => 1 [0] => 1 [1] => 2 [7] => 2 [2] => 3 [8] => 3 [3] => 4 [9] => 4 [4] => 5 [10] => 5 [5] => 6 [11] => 6 )
Output for 5.5.24 - 5.5.35, 5.6.8 - 5.6.28
Parse error: syntax error, unexpected '>' in /in/jFpl1 on line 6
Process exited with code 255.

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