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run code in 150+ php & hhvm versions
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<?php $a = array('a' => 10, 'z' => 10, 'c' => 10, 'b' => 11, 'd' => 10); print_r(array_flip($a));
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
Array ( [10] => d [11] => b )