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<?php $a = array('1' => 'A', 'B', "C", '3' => 'D'); var_dump($a);
based on FXJSj
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(3) { [1]=> string(1) "A" [2]=> string(1) "B" [3]=> string(1) "D" }