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run code in 200+ php & hhvm versions
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<?php $array = ['test1' => '', 'test2' => null]; var_dump(empty($array));
Output for 5.6.0 - 5.6.30, hhvm-3.18.5 - 3.22.0, 7.0.0 - 7.3.0rc3
bool(false)