Usage of Orderby in Laravel/Order by usage in laravel based on condition | Learning Curve- Perfect Tutorial for the beginers

Sample code for orderby in laravel

$details =system_management::where('id', '=', $id)
				->where('f_name', '!=', 'vasanthan')
				->where('l_name', '!=', 'pv');
				
				if($orderby=='' || $sortby==''){
				$details->orderBy('l_name', 'asc');				
				}
				else
				{
				$details->orderBy($orderby, $sortby);
				}
				$details =$details->paginate(9);

$details =system_management::where('id', '=', $id)

->where('f_name', '!=', 'vasanthan')

->where('l_name', '!=', 'pv');

if($orderby=='' || $sortby==''){

$details->orderBy('l_name', 'asc');

}

else

{

$details->orderBy($orderby, $sortby);

}

$details =$details->paginate(9);