$array = [['id' => 1, 'name' => 2, 'pop' => 3], ['id' => 1, 'name' => 2, 'pop' => 3] , ['id' => 1, 'name' => 2, 'pop' => 3]];
$array_to = ['id' => 0, 'name' => 0, 'pop' => 0];
foreach ($array as $item) {
foreach ($item as $key => $item_to) {
$array_to[$key] += $item_to;
}
}