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<?php var_dump(array("1" => "A", 1 => "B", "C", 2 => "D"));
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(2) { [1]=> string(1) "B" [2]=> string(1) "D" }