<?php $a = array( array( array(1), array(), ), array(1), array(), array(2), ); $c = function($a) use (&$c) { return is_array($a) ? array_filter(array_map($c, $a), function ($b) { return !(is_array($b) && empty($b)); }) : $a; }; var_dump($c($a));
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