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run code in 200+ php & hhvm versions
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<?php $array = array(1,22,54,75,90,364); $keys = array_keys($array); Var_dump($keys);
Output for 5.6.0 - 5.6.30, hhvm-3.15.4, 7.0.0 - 7.2.0
array(6) { [0]=> int(0) [1]=> int(1) [2]=> int(2) [3]=> int(3) [4]=> int(4) [5]=> int(5) }