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<?php $array = [['range' => 336, 'year' => 2020],['range' => 336, 'year' => 2020],['range' => 390, 'year' => 2020],['range' => 390, 'year' => 2021]]; $newDatesCurrent = []; foreach($array as $value) { $newDatesCurrent[] = ['range' => $value['range'], 'year' => $value['year'], 'month' => 222]; } print_r($newDatesCurrent);

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