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run code in 200+ php & hhvm versions
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<?php $array = [null, null, null]; $t = array_filter($array, function($value){ return $value !== ''; }); var_dump($t);
Output for 5.6.0 - 5.6.30, hhvm-3.15.4, 7.0.0 - 7.2.0
array(3) { [0]=> NULL [1]=> NULL [2]=> NULL }