title: Laravel 5: return number of affected rows MySQL
body: <p>how to return something similar to PHP function <code>mysql_affected_rows()</code> when use Laravel 5 DB class,</p>
  
  <p>ex:
  <code>DB::delete("DELETE FROM chat WHERE user_id = {$mid}");</code></p>
  
  <p>how to return number of affected rows?</p>
  
  <p>thanks,</p>