删除Json输出的引号

删除json输出的双引号：
[{"id":"1","nom":"Magasin Jardins 2","ville":"Paris","latlng":["36.85715,10.127245"]}

latlng值：[36.85715,10.127245]

代码：

  $qry = "SELECT *FROM magasin";
    $result = mysql_query($qry);
  //  $promotions = array();
    $response = array();
    while($row = mysql_fetch_assoc($result)) {
   // $promotions[]= $row;
 $magasin = array();
        $magasin["id"] = $row["id"];
        $magasin["nom"] = $row["nom"];
        $magasin["ville"] = $row["ville"];
        $lat = $row[latitude];
        $long = $row[longitude];
       $magasin["latlng"][] =floatval($lat).",".floatval($long);;  
// push single product into final response array
        array_push($response, $magasin);
    }
     mysql_close($con);
  echo json_encode($response); 

[
  {
    "id": "1",
    "nom": "Magasin Jardins 2",
    "ville": "Paris",
    "latlng": [
      "36.85715,10.127245"
    ]
  }
]

可以看出latlng是一个JSONArray，一个"36.85715,10.127245"是一个字符串