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run code in 200+ php & hhvm versions
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<?php print_r(array_map(function($a) { return $a + 1; }, [1, 2, 3, 4, 5]));
Output for 5.6.0 - 5.6.30, hhvm-3.15.4, 7.0.0 - 7.3.0rc3
Array ( [0] => 2 [1] => 3 [2] => 4 [3] => 5 [4] => 6 )