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run code in 200+ php & hhvm versions
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<?php $a = array( "1" => "A", 1 => "B", "C", 2 => "D"); echo count($a), "\n"; var_dump($a);
based on MCBAl
Output for 4.3.0 - 7.1.7
2 array(2) { [1]=> string(1) "B" [2]=> string(1) "D" }