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run code in 200+ php & hhvm versions
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<?php $data = []; $data['data'][] = 'beepetyboopety'; var_dump($data);
Output for 5.6.0 - 5.6.30, hhvm-3.15.4, 7.0.0 - 7.3.0rc3
array(1) { ["data"]=> array(1) { [0]=> string(14) "beepetyboopety" } }