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run code in 150+ php & hhvm versions
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<?php $arr=array(5 => 43, 32, 56, "b" => 12); var_dump($arr);
Output for 4.3.0 - 5.6.21, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(4) { [5]=> int(43) [6]=> int(32) [7]=> int(56) ["b"]=> int(12) }