Restructure/Pivot json data

I have a JSON array and I need to change that into another array format. Please look into the following data:

{
    "BUS NO.1": [
        {"trip":"Trip00011","runningKm": "5000"},
        {"trip":"Trip00012","runningKm":"2565"}
    ],
    "BUS NO.2":[
        {"trip":"Trip00021","runningKm": "2400"},
        {"trip":"Trip00023","runningKm":"1500"},
        {"trip":"Trip00025","runningKm":"3000"}
    ]
}

Desired result:

{
    "data": [
        {
            "y": "BUS NO.1",
            "Trip00011": "5000",
            "Trip00012": "2565"
        },
        {
            "y": "BUS NO.2",
            "Trip00021": "2400",
            "Trip00023": "1500",
            "Trip00025": "3000"
        }
    ]
}

Try this one. You'll only need 1 loop and an array_merge.

$originalData = [
    [
        'vehicle' => 'BUS NO.1',
        'trip_name' => 'Trip00011', 
        'running_km' => '5000'
    ],
    [
        'vehicle' => 'BUS NO.2',
        'trip_name' => 'Trip00021', 
        'running_km' => '2400'
    ],
    [
        'vehicle' => 'BUS NO.2',
        'trip_name' => 'Trip00023', 
        'running_km' => '1500'
    ],
];

$responseData = [];

foreach ($originalData as $od){
    $temp = [
        'y' => $od['vehicle'],
    ];

    $temp[$od['trip_name']] = $od['running_km'];

    if (!isset($responseData[$od['vehicle']])){
        $responseData[$od['vehicle']] = $temp;  
    } else {
        $responseData[$od['vehicle']] = array_merge($responseData[$od['vehicle']], $temp);
    }
}

echo json_encode(array_values($responseData));

Output (JSON): [{"y":"BUS NO.1","Trip00011":"5000"},{"y":"BUS NO.2","Trip00021":"2400","Trip00023":"1500"}]