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run code in 150+ php & hhvm versions
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<?php $a = array('0' => 1, '1' => 2, '2' => 3); $b = array('0' => 1,'1' => 2, '2' => 3, '3' => 4); var_dump($a+$b);
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(4) { [0]=> int(1) [1]=> int(2) [2]=> int(3) [3]=> int(4) }