php - building search query in laravel5 gives error Syntax error or access violation: 1064 -

i want implement simple search functionality in laravel5 app

use db; use app\models\user; use illuminate\http\request;  use connectin\http\requests;  class searchcontroller extends controller {     public function getresults(request $request)     {          $query = $request->input('name');         if (!$query) {             return  redirect()-> route('home') -> with('info', "search must contain charactres");         }         else{          $users = user::where(db::raw("concat (first_name, ' ', last_name), "),         "like", "%{$query}%")     ->orwhere('username', "like", "%{$query}%")     ->get();     dd('search ok' . $users);     }         return view('search.results');     }  } 

with code provided above error

    queryexception in connection.php line 673: sqlstate[42000]: syntax error or access violation: 1064 have error in sql syntax; check manual corresponds mariadb server version right syntax use near ' ? or `username` ?' @ line 1 (sql: select * `users` concat (fisrt_name, ' ', last_name), %s% or `username` %s%)     in connection.php line 673     @ connection->runquerycallback('select * `users` concat (fisrt_name, ' ', last_name), ? or `username` ?', array('%{$query}%', '%{$query}%'), object(closure)) in connection.php line 629     @ connection->run('select * `users` concat (fisrt_name, ' ', last_name), ? or `username` ?', array('%{$query}%', '%{$query}%'), object(closure)) in connection.php line 342     @ connection->select('select * `users` concat (fisrt_name, ' ', last_name), ? or `username` ?', array('%{$query}%', '%{$query}%'), true) in builder.php line 1508     @ builder->runselect() in builder.php line 1494     @ builder->get(array('*')) in builder.php line 596     @ builder->getmodels(array('*')) in builder.php line 303     @ builder->get() in searchcontroller.php line 25     @ searchcontroller->getresults(object(request))     @ call_user_func_array(array(object(searchcontroller), 'getresults'), array(object(request))) in controller.php line 80     @ controller->callaction('getresults', array(object(request))) in controllerdispatcher.php line 146     @ controllerdispatcher->call(object(searchcontroller), object(route), 'getresults') in controllerdispatcher.php line 94     @ controllerdispatcher->illuminate\routing\{closure}(object(request))     @ call_user_func(object(closure), object(request)) in pipeline.php line 52     @ pipeline->illuminate\routing\{closure}(object(request))     @ call_user_func(object(closure), object(request)) in pipeline.php line 103     @ pipeline->then(object(closure)) in controllerdispatcher.php line 96     @ controllerdispatcher->callwithinstack(object(searchcontroller), object(route), object(request), 'getresults') in controllerdispatcher.php line 54 

first check $query contain string search

user::where(db::raw('concat(first_name," ", last_name)'), 'like', '%'.$query.'%')->orwhere('username', 'like', '%'.$query.'%')->get();