Nullable - Chain calls on Null for PHP

composer require xiyusullos/nullable

<?phpuse xiyusullos\Nullable;class Obj{    use Nullable;        // ...}$obj = new Obj();echo $obj->a->b->c;

<?phpnamespace App\Models;use Illuminate\Database\Eloquent\Model;use xiyusullos\Nullable;class Profile extends Model{    // supposed an attribute of departmentName    use Nullable;    public function user()    {        return $this->belongsTo(User::class);    }    // ...}class User extends Model{    use Nullable;    public function profile()    {        return $this->hasOne(Profile::class);    }    // ... }class Blog extends Model{    use Nullable;    public function user()    {        return $this->belongsTo(User::class);    }    // ...}// wanna get the writer's department name who posted the blog #1// without Nullable$blog = Blog::find(1);$user = $blog->user;if ($user) {    $profile = $user->profile;    if ($profile) {        $departmentName = (string) $profile->departmentName;    }} // that's so annoying!// with Nullable$blog = Blog::find(1);$departmentName = (string) $blog->user->profile->departmentName;