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run code in 150+ php & hhvm versions
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<?php $a = array(1,2,2,1,1); $b = array("1"=>1,"2"=>1); foreach (array_unique($a) as $key => $value) { echo "$key => $value</br>"; }
Output for 4.3.0 - 5.6.14, 5.6.16 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
0 => 1</br>1 => 2</br>
Output for 5.6.15, hhvm-3.10.0

Process exited with code 137.