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<?php $test = array('a', 'b', 'c'); var_dump(array_flip($test));
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(3) { ["a"]=> int(0) ["b"]=> int(1) ["c"]=> int(2) }