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<?php var_dump( array( 'test1' => 1, 'test2' => 2, ) + array( 'test2' => 20, 'test3' => 30, ) );
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(3) { ["test1"]=> int(1) ["test2"]=> int(2) ["test3"]=> int(30) }