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run code in 300+ PHP versions simultaneously
<?php $array = [ 'a' => 'a', 'b' => '', 'c' => null, 'd' => 122, 'e' => 0, 'f' => [ 'g' => 'g', 'h' => 0, 'i' => null, 'j' => '' ] ]; $result = array_filter($array, function ($arr) { if (!is_array($arr)) { return strlen($arr) ; } return array_filter($arr) ; } ) ; $r = array_filter($array) ; var_dump($r);

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