title: Class PDO not found in laravel 5.2
body: <p>i have a DB helper and code is in this way:</p>
  
  <pre><code>&lt;?php
  
  namespace App\Business;
  
  use DB;
  
  Class DBHelper{
  
      private function dbConnectionInfo()
  
  
      {
  
      //$results = DB::select('Select UserName from user_master');
              //return "fetchUserLocation success". json_encode($results) ;
          $pdo_db = DB::connection()-&gt;getPdo() ;
          $pdo_db-&gt;setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
          return $pdo_db;
  
      }   
  
      function executeResultSet($DBQuery)
      {
          $pdo_object = DBHelper :: dbConnectionInfo();
          $stmt = $pdo_object-&gt;prepare($DBQuery);
          $stmt-&gt;execute();
          $results = $stmt-&gt;fetchAll(PDO::FETCH_ASSOC);
          return $results;
      }
  
      function dbConnection()
      {
          return  DBHelper :: dbConnectionInfo();
      }
  }
  
  ?&gt;
  </code></pre>
  
  <p>When i call return "fetchUserLocation success". json_encode($results) ; it executed that means DB connection works properly but when i call the function error : Class 'App\Business\PDO' not found
  How can i use PDO in this code. please suggest </p>