3v4l.org

run code in 300+ PHP versions simultaneously
<?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);

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50.15 ms | 402 KiB | 5 Q