Чтение из массива объектов

Хочу из такого JSON

[
    {
        "y": "test1",
        "list_of": [
            {
                "v":1,
                "name": "value1"
            },
            {
                "v":2,
                "name": "value2"
            }
        ]
    },
    {
        "y": "test2",
        "list_of": [
            {
                "v":3,
                "name": "value3"
            },
            {
                "v":4,
                "name": "value4"
            }
        ]
    }
]

вытащить name и v и их значения:

$FirstJSON = json_decode(file_get_contents('list.json'), true);
foreach ($FirstJSON as $arrays) {
    foreach($arrays as $array) {
        foreach ($array as $jsons){
            foreach ($jsons as $key => $value){
                echo $key . " => " . $value . "\n";
            }
        }    
    }        
}

Вродебы все есть, но warning:

Warning: Invalid argument supplied for foreach() in on line 20
v => 1
name => value1
v => 2
name => value2
Warning: Invalid argument supplied for foreach() in on line 20
v => 3
name => value3
v => 4
name => value4