array_key_exists()异常错误，为什么不处理false

Question

我得到了这个错误..使用这种模型执行时，CREATED_AT和UPDATED_AT上初始化false，我得到了array_key_exists((的错误，但是当我使用空值初始化时，我的模型正常工作..谁能解释我为什么会有这种行为？
我正在使用拉拉维尔5.6版本..

Seeding: CouponTableSeeder
   ErrorException  : array_key_exists(): The first argument should be either a string or an integer
  at /Applications/XAMPP/xamppfiles/htdocs/sites/FakeProject/vendor/laravel/framework/src/Illuminate/Database/Eloquent/Concerns/HasAttributes.php:1028
    1024|         // Here we will spin through every attribute and see if this is in the array of
    1025|         // dirty attributes. If it is, we will return true and if we make it through
    1026|         // all of the attributes for the entire array we will return false at end.
    1027|         foreach (Arr::wrap($attributes) as $attribute) {
  > 1028|             if (array_key_exists($attribute, $changes)) {
    1029|                 return true;
    1030|             }
    1031|  
   }
1032| 

型：

class Coupon extends Model
{
    protected $table = 'coupons';
    protected $primaryKey = 'coupon_id';
    public $incrementing = false;
    const CREATED_AT = false;
    const UPDATED_AT = false;
    protected $fillable = [
        'coupon_id','title','amount','price','type','created_at','expired_at'
    ];
}

Answer 1

使用

public $timestamps = false;

当您不需要created_at和updated_at字段时