Online PHP editor | output for sWBZr

<?php $mobiles_sold = array( '1_DAY_2017' => array('SAMSUNG' => array(549, 199, 999), 'XIAOMI' => array(199, 2999, 499)), '2_DAY_2017' => array('SAMSUNG' => array(699, 999), 'LENOVO' => array(280, 2550, 849)), '3_DAY_2017' => array('OPPO' => array(500, 599), 'SAMSUNG' => array(799)), '4_DAY_2017' => array('SAMSUNG' => array(1299, 499, 799, 2500), 'OPPO' => array(299, 349, 499)), '5_DAY_2017' => array('XIAOMI' => array(500, 270, 340), 'VIVO' => array(4599, 299)), '6_DAY_2017' => array('VIVO' => array(240, 1899, 759, 530), 'OPPO' => array(999)), '7_DAY_2017' => array('OPPO' => array(300, 252, 1290), 'LENOVO' => array(570, 1300, 666)), ); $result = []; foreach ($mobiles_sold as $day) { foreach ($day as $key => $value) { if (!array_key_exists($key, $result)) { $result[$key] = array_sum($value); continue; } $result[$key] += array_sum($value); } } print_r($result);