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run code in 150+ php & hhvm versions
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<?php var_dump(array_flip(array('a' => 1, 'b' => 2, 'c' => 3)));
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(3) { [1]=> string(1) "a" [2]=> string(1) "b" [3]=> string(1) "c" }