isEmpty（）方法是否适用于$ request？

Question

Is it possible to use isEmpty() method for validating a input a for empty field? I have a validate($request) where it has a multiple form to be filled up. I have additional form where it's not totally required.

Controller:

$this->validate($request,
[
    'title' => 'required|regex:/(^[A-Za-z0-9 ]+$)+/|max:255',
    'content' => 'required',
    'category' => 'required',
    'approver' => 'required',
    'recipient' => 'required',
]);     


$document = new Document();
$user = Auth::user();
                                //Request in the form
$document->title = $request->title;
$document->content = $request->content;
$document->category_id = $request->category;
$document->save();

foreach($request->recipient as $recipientId)
{
    $document->sentToUsers()->sync([ $recipientId => ['sender_id' => $user->id]],false );
}

I have a form name department which is not required to be filled out. I'm trying to check if it's not empty it will insert this into database. If empty nothing will happen.

if(!$request->department->isEmpty())
{
    foreach($request->department as $departmentId)
    {
        foreach(Department::find($departmentId)->users()->get() as $user1) //find the users belonging to the current department
        {
            $document->sentToUsers()->sync([ $user1->id => ['sender_id' => $user->id]],false );
        }
    }
}
else
{

}

Answer 1

You can always use empty():

if(!empty($request->department))

I guess isEmpty() is for collection only and you're checking property of Request object:

The isEmpty method returns true if the collection is empty; otherwise, false is returned