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run code in 150+ php & hhvm versions
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<?php $array = array(5612 => 'my note'); $keys = array_keys($array); print_r($keys); ?>
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.13.2, 7.0.0 - 7.1.0
Array ( [0] => 5612 )