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<?php $a = array( 2,55,6);var_dump( array_flip($a) );
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(3) { [2]=> int(0) [55]=> int(1) [6]=> int(2) }