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run code in 200+ php & hhvm versions
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<?php $a = array('code' => 500, 'am' => 600); $b = array('am' => 40); var_dump(array_merge($a, $b));
Output for 4.3.0 - 7.2.0
array(2) { ["code"]=> int(500) ["am"]=> int(40) }