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<?php $a = array( 2 => 'a', 1 => 'b', 0 => 'c', ); var_dump(array_keys($a));
Output for 4.3.0 - 5.6.21, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(3) { [0]=> int(2) [1]=> int(1) [2]=> int(0) }