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<?php $arrays = [ "a" => [ "name" => "Name 1", "age" => "99", "add" => null, ], "b" => [ "name" => "Name 2", "age" => "99", "add" => "Add2", ], "c" => [ "name" => "Name 3", "age" => "99", "add" => "Add3", ], "d" => [ "name" => "fgf", "age" => "fgbh", "add" => "Add4", ], ]; $result = []; array_walk($arrays, function ($el, $key) use (&$result) { $empty = array_filter($el, function ($el) { return $el == ""; }); $empty_keys = array_keys($empty); if (count($empty_keys)) { $result[$key] = $empty_keys; } }); print_r($result);