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<?php $a=array('b','c','d'); var_dump(array_flip($a));
Output for 5.2.15 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(3) { ["b"]=> int(0) ["c"]=> int(1) ["d"]=> int(2) }