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<?php $a = array( array( array(1), array(), ), array(1), array(), array(2), ); $c = function($a) use (&$c) { if (is_array($a)) { $a = array_map($c, $a); $a = array_filter($a); } return $a; }; var_dump($c($a));
Output for git.master, git.master_jit, rfc.property-hooks
array(3) { [0]=> array(1) { [0]=> array(1) { [0]=> int(1) } } [1]=> array(1) { [0]=> int(1) } [3]=> array(1) { [0]=> int(2) } }

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