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run code in 150+ php & hhvm versions
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<?php $a = array(10 => 5, 20 => 40); $b = array(10 => 80); var_dump($a + $b);
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(2) { [10]=> int(5) [20]=> int(40) }