Как преобразовать json в определенный вид?

Question

[Triglav77]

Собираю массив в цикле из БД

$data[] = [
    'proto' => $protos[$protoid],
    'localip' => long2ip($row['nIPv4Left']),
    'port' => $row['nPortLeft']
];

преобразовываю в json

echo json_encode($data);

получаю такой вид

[
	{"proto":null,"localip":"0.0.0.222","port":11018},
	{"proto":null,"localip":"192.168.69.138","port":41752},
	{"proto":null,"localip":"0.0.0.76","port":46907},
	{"proto":null,"localip":"0.0.0.244","port":26114},
	{"proto":null,"localip":"0.0.0.242","port":1112}
]

а как преобраpовать его в такой json

{  
    "data":
	[
		{"proto":null,"localip":"0.0.0.222","port":11018},
		{"proto":null,"localip":"192.168.69.138","port":41752},
		{"proto":null,"localip":"0.0.0.76","port":46907},
		{"proto":null,"localip":"0.0.0.244","port":26114},
		{"proto":null,"localip":"0.0.0.242","port":1112}
	]
}