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<?php $a = array( "1" => "a", 1 => "b", "c", 2 => "d" ); var_dump( $a );
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.13.2, 7.0.0 - 7.1.0
array(2) { [1]=> string(1) "b" [2]=> string(1) "d" }