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<?php $a = ['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h' ,'i', 'j', 'k']; $columnCount = 2; $columns = []; foreach ($a as $i => $key) { $columns[$i % $columnCount][] = $key; } var_dump($columns);
Output for 5.6.0 - 5.6.30, hhvm-3.15.4, 7.0.0 - 7.3.1
array(2) { [0]=> array(6) { [0]=> string(1) "a" [1]=> string(1) "c" [2]=> string(1) "e" [3]=> string(1) "g" [4]=> string(1) "i" [5]=> string(1) "k" } [1]=> array(5) { [0]=> string(1) "b" [1]=> string(1) "d" [2]=> string(1) "f" [3]=> string(1) "h" [4]=> string(1) "j" } }