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<?php $a = array('a' => 1, 'b' => 2, 'c' => 3); $b = array('a' => 1,'b' => 2, 'c' => 3, 'd' => 4); var_dump($a+$b);
Output for 4.3.0 - 7.2.0
array(4) { ["a"]=> int(1) ["b"]=> int(2) ["c"]=> int(3) ["d"]=> int(4) }