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run code in 150+ php & hhvm versions
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<?php $arr=array(1=>1,2=>2); var_dump($arr);
based on g2fT9
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(2) { [1]=> int(1) [2]=> int(2) }