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run code in 200+ php & hhvm versions
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<?php $arr = array( array( array() ), array() ); $filter = array_filter($arr); print_r($filter); var_dump(empty($filter));
based on LUiqp
Output for 4.3.0 - 7.2.0
Array ( [0] => Array ( [0] => Array ( ) ) ) bool(false)