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run code in 150+ php & hhvm versions
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<?php $queue = array("Taeyeon","NAN"); array_push($queue , "Boram" ,"Jessica"); print_r($queue); ?>
based on d9hCJ
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
Array ( [0] => Taeyeon [1] => NAN [2] => Boram [3] => Jessica )