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run code in 200+ php & hhvm versions
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<?php $results = null; $results[null] = 'No available export'; var_dump($results); var_dump($results[null]);
based on SHcNr
Output for 5.6.0 - 5.6.30, hhvm-3.15.4, 7.0.0 - 7.2.6
array(1) { [""]=> string(19) "No available export" } string(19) "No available export"