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run code in 200+ php & hhvm versions
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<?php $a = array( "1" => "A", "3" => "B", ); echo count($a); // returns 2 var_dump( $a );
based on UMW0a
Output for 4.3.0 - 7.2.0
2array(2) { [1]=> string(1) "A" [3]=> string(1) "B" }