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<?php $whiteListKeys = array(); $whiteListKeys['category'] = 'category'; var_dump($whiteListKeys);
based on 5rcgQ
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(1) { ["category"]=> string(8) "category" }