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run code in 150+ php & hhvm versions
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<?php $input = array(); $result = array_pad($input, 5, ''); $res1[4]=array("dfdfd"); $result=array_merge($result,$res1); print_r($result);
Output for 4.3.0 - 7.1.0
Array ( [0] => [1] => [2] => [3] => [4] => [5] => Array ( [0] => dfdfd ) )