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<?php $array = array('a' => 2, 'b' => 1, 'c' => 4); list($array['a'], $array['c']) = array($array['c'], $array['a']); print_r($array);
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
Array ( [a] => 4 [b] => 1 [c] => 2 )