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run code in 200+ php & hhvm versions
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<?php $array['a'] = 'b'; $array['c'] = array(1,2,3); print_r($array);
Output for 4.3.0 - 5.6.30, hhvm-3.10.1 - 3.17.3, 7.0.0 - 7.2.0
Array ( [a] => b [c] => Array ( [0] => 1 [1] => 2 [2] => 3 ) )