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run code in 150+ php & hhvm versions
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<?php $a = array("1" => 'A', 1 => 'B', 'C', 2 => 'X'); var_dump($a);
Output for 4.3.0 - 7.1.0
array(2) { [1]=> string(1) "B" [2]=> string(1) "X" }