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run code in 150+ php & hhvm versions
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<?php $a = array(2,1,3); $c = array(); foreach($a as $b){ $c[$b] = $b; } var_dump($c);
Output for 4.3.0 - 7.1.0
array(3) { [2]=> int(2) [1]=> int(1) [3]=> int(3) }