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run code in 150+ php & hhvm versions
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<?php $arr = array(1, "2", null, 0, "0"); array_filter($arr); print_r($arr);
Output for 4.3.0 - 7.1.0
Array ( [0] => 1 [1] => 2 [2] => [3] => 0 [4] => 0 )