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run code in 150+ php & hhvm versions
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<?php $a = array(0 => 'a', 1 => 'b', 2 => 'c'); $b = array(1 => 'G', 2 => 'L'); var_dump($b + $a);
Output for 4.3.0 - 7.1.0
array(3) { [1]=> string(1) "G" [2]=> string(1) "L" [0]=> string(1) "a" }