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run code in 150+ php & hhvm versions
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<?php $input = array("1"); print_r(array_chunk($input, 4));
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
Array ( [0] => Array ( [0] => 1 ) )