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run code in 150+ php & hhvm versions
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<?php print_r(array_keys(array('val1' => 'hello', 'val2' => 'bye')));
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
Array ( [0] => val1 [1] => val2 )