laravel-5.7/mysql

在我的数据库中，有一个json格式的字段，如下所示：
字段名称：功能：

[
    {"id": 1, "url": null, "name": "A"}, 
    {"id": 2, "url": null, "name": "B"}
]

同样在它的模型中，我写了这个

protected $casts = [
    'features' => 'array'
  ];

现在我创建一个数组：

$features = array();

temp = array();
temp['id'] = 1;
temp['url'] = null;
temp['name'] = A;
$features[] = temp;

temp = array();
temp['id'] = 2;
temp['url'] = null;
temp['name'] = B;
$features[] = temp;

我怎么比较 $features array 与 features field 在数据库里？
ّ我查了一下：

$fff = \App\Cart::whereFeatures($features)->get()->first();

或

$fff = \App\Cart::whereFeatures(json_encode($features))->get()->first();

或者

$fff = \App\Cart::whereFeatures(json_encode($features,JSON_UNESCAPED_UNICODE))->get()->first();