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<?php var_dump( array( 'user' => 'a', ) + array( 'pass' => null ) );
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(2) { ["user"]=> string(1) "a" ["pass"]=> NULL }