Route with out parameter works fine, but with parameter view is not working properly in Laravel 5 -

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routes.php 

route::get('/viewprofile/{uid?}','usercontroller@viewprofile');

usercontroller.php

public function viewprofile($uid){         if ($uid <> null)         {            $getuser = user::where('id','=',$uid)->first();             return view('user.profile')->with('getuser',$getuser);         }     }

inbox.blade.php 

<a href="{{ url::to('viewprofile',[$msg->user->id]) }}"> {{$msg->user->username }} </a>

when use route parameter profile.blade.php page design collapses, when use simple route route::get('/viewprofile','usercontroller@viewprofile');
it works fine. need help! in advance.


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