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run code in 150+ php & hhvm versions
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<?php $fu = array(0 =>'a', 1 => 'b', 2 => 'c'); print_r(array_keys($fu)); ?>
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
Array ( [0] => 0 [1] => 1 [2] => 2 )