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<?php $arr1 = array(0=>1); $arr2 = array(0=>2); $merged = array_merge($arr1,$arr2); print_r($merged);
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
Array ( [0] => 1 [1] => 2 )