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run code in 150+ php & hhvm versions
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<?php $null = NULL; $cast_null = (array) $null; var_dump($null); var_dump($cast_null);
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
NULL array(0) { }