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run code in 200+ php & hhvm versions
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<?php $a1 = array('A' => 3, 'B' => 4); $a2 = array(); print_r(array_keys($a1)+array_values($a2));
based on 09pqQ
Output for 4.3.0 - 7.2.0
Array ( [0] => A [1] => B )