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<?php $a = array('two' => 'two', 'three' => 3); $b = array('one' => 1, 'two' => 2); $a += $b; var_dump($a);
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(3) { ["two"]=> string(3) "two" ["three"]=> int(3) ["one"]=> int(1) }