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