3v4l.org

run code in 300+ PHP versions simultaneously
<?php $array = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19]; $array = array_map(function(array $chunk): float { return array_sum($chunk) / count($chunk); }, array_chunk($array, 5)); var_dump($array);
Output for 7.1.0 - 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 - 8.1.28, 8.2.0 - 8.2.19, 8.3.0 - 8.3.7
array(4) { [0]=> float(2) [1]=> float(7) [2]=> float(12) [3]=> float(17) }
preferences:
191.03 ms | 403 KiB | 201 Q