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<?php $ar = array('q'=>1, 'w'=>2, 'e'=>3); var_dump(array_keys($ar));
based on Zsjp9
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(3) { [0]=> string(1) "q" [1]=> string(1) "w" [2]=> string(1) "e" }