Синтаксическая ошибка PHP : syntax error, unexpected '='

вот строка с ошибкой :

 result = mysqli_query ("SELECT * FROM 'news' ORDER BY 'id' DESC LIMIT  $limit");

вот весь код:

 $mysqli = false;
 function connectDB() {
     global $mysqli;
     $mysqli = new mysqli("localhost", "root", "", "myste");
 }
 function closeDB () {
     global $mysqli;
     $mysqli_close ();
 }
 function getNews ($limit) {
     global $mysqli;
     connectDB();
     result = mysqli_query ("SELECT * FROM 'news' ORDER BY 'id' DESC LIMIT  $limit");
     closeDB();
     return resultToArray ($result);
 }
 function resultToArray ($result) {
     $array = array();
     while (($row = $result_fetch_assoc()) != false)
         $array[] = $row;
     return $array;
 }

?>