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<?php $array = array('a','b','c','c'); $newArray = array_flip($array); print_r(array('array' => $array, 'newArray' => $newArray));
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
Array ( [array] => Array ( [0] => a [1] => b [2] => c [3] => c ) [newArray] => Array ( [a] => 0 [b] => 1 [c] => 3 ) )