<?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);
preferences:
27.9 ms | 402 KiB | 5 Q