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