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<?php $arr = [ [ 'country' => 'Россия', 'city' => 'Москва', ], [ 'country' => 'Беларусь', 'city' => 'Минск', ], [ 'country' => 'Россия', 'city' => 'Питер', ], [ 'country' => 'Россия', 'city' => 'Владивосток', ], [ 'country' => 'Украина', 'city' => 'Львов', ], [ 'country' => 'Беларусь', 'city' => 'Могилев', ], [ 'country' => 'Украина', 'city' => 'Киев', ], ]; $newCountries = []; foreach ($arr as $country) { if (isset($newCountries[$country['country']])) { array_push($newCountries[$country['country']], $country['city']); } else { $newCountries[$country['country']] = [$country['city']]; } } var_dump($newCountries);
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