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<?php $input = array("1","2","3","4","5"); print_r(array_chunk($input, 4));
Output for 4.3.0 - 7.1.7
Array ( [0] => Array ( [0] => 1 [1] => 2 [2] => 3 [3] => 4 ) [1] => Array ( [0] => 5 ) )