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run code in 200+ php & hhvm versions
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<?php $a = array('a','b','c'); $b = array_reverse($a); $c = array_merge($a,$b); print_r($c);
Output for 4.3.0 - 7.2.0
Array ( [0] => a [1] => b [2] => c [3] => c [4] => b [5] => a )