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run code in 200+ php & hhvm versions
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<?php $toto = null; $toto['key'] = 'testy'; var_dump($toto);
Output for 5.3.0 - 5.6.30, hhvm-3.10.1 - 3.17.3, 7.0.0 - 7.2.0
array(1) { ["key"]=> string(5) "testy" }