3v4l.org

run code in 300+ PHP versions simultaneously
<?php $items=[3,7,2,9,2,3,8]; $c = function($a, $b) { return $a <=> $b; }; uasort($items, $c); print_r($items);
Output for 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.30, 8.0.0 - 8.0.20, 8.1.0 - 8.1.7
Array ( [2] => 2 [4] => 2 [0] => 3 [5] => 3 [1] => 7 [6] => 8 [3] => 9 )
Output for 5.6.0 - 5.6.40
Parse error: syntax error, unexpected '>' in /in/eQlJT on line 5
Process exited with code 255.

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