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<?php $combined = array( 'A' => array( 'B' => array( 'C' => array(1, null), ), 'D' => array( 'K' => array(null, null), ) ), ); function _nullifyEmpty(array $array) { $nulls = 0; foreach ($array as $key => $value) { if (is_array($value)) { $array[$key] = _nullifyEmpty($value); } elseif (null === $value) { ++$nulls; } } if ($nulls === count($array)) { return null; } return $array; } print_r(_nullifyEmpty($combined));
Output for git.master, git.master_jit, rfc.property-hooks
Array ( [A] => Array ( [B] => Array ( [C] => Array ( [0] => 1 [1] => ) ) [D] => Array ( [K] => ) ) )

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