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run code in 200+ php & hhvm versions
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<?php $a = array_fill_keys(array('a', 'b'), array('rt', 're')); print_r($a);
based on TULAL
Output for 5.6.0 - 5.6.30, hhvm-3.18.5 - 3.22.0, 7.0.0 - 7.3.0beta1
Array ( [a] => Array ( [0] => rt [1] => re ) [b] => Array ( [0] => rt [1] => re ) )