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run code in 150+ php & hhvm versions
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<?php $array1[0] = "zero"; $array1[1] = "one"; $array2[1] = "one"; $array2[2] = "two"; $array2[3] = "three"; print_r($array1 + $array2);
based on Ainou
Output for 4.3.0 - 7.1.0
Array ( [0] => zero [1] => one [2] => two [3] => three )