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run code in 150+ php & hhvm versions
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<?php $arr1 = array('mango' => 20); $arr2 = array('apple' => 10); $arr = $arr1 + $arr2; print_r($arr);
Output for 4.3.0 - 5.6.25, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
Array ( [mango] => 20 [apple] => 10 )