"Use of undefined constant name - assumed 'name' (this will throw an Error in a future version of PHP)" kn laravel

When I am trying to update the file then getting error like "Use of undefined constant name - assumed 'name' (this will throw an Error in a future version of PHP)" kn laravel

public function update(Request $request, $id) {

    $this->validate($request,[

        'name'=>'required',
        'designation'=>'required',
        'contact_ph'=>'required',
        'contact_email'=>'required',
        'featured'=>'mimes:jpeg,pdf,docx,png:5000',
    ]);

    $staff=Staff::find($id);

    if($request->hasFile('featured'))

    {
        $featured=$request->featured;
        $featured_new_name =time() .$featured->getClientOriginalName();
        $featured->move('uploads/srcpost', $featured_new_name);
        $staff->featured='uploads/srcposts/'. $featured_new_name;

    }

    $staff->name=$request=name;
    $staff->designation=$request=designation;
    $staff->ordering=$request=ordering;

    $staff->save();

    return redirect()->back();




}

via Chebli Mohamed