php mysql查询WHERE columnName等于变量

Question

所以我有这个PHP代码：

$des = 'Caticlan, Aklan';

require_once('dbConnect.php');

$sql = "SELECT * FROM appDB WHERE route='".$des."%'";
$r = mysqli_query($con,$sql) or die(mysqli_error($con));


$result = array();

//$row = mysqli_fetch_array($r);
while($row = mysqli_fetch_array($r)){
array_push($result,array(
        "id"=>$row['id'],
        "route"=>$row['route'],
        "busName"=>$row['busName'],
        "busType"=>$row['busType'],
        "assignedTerminal"=>$row['assignedTerminal'],
        "timeFirstTrip"=>$row['timeFirstTrip'],
        "timeLastTrip"=>$row['timeLastTrip'],
        "timeInterval"=>$row['timeInterval'],
        "estFare"=>$row['estFare'],
        "estDistance"=>$row['estDistance'],
        "estTravelTime"=>$row['estTravelTime'],
        "DualRoute"=>$row['DualRoute']

));  }

echo json_encode(array('busDetails'=>$result));

mysqli_close($con);

它应该返回来自db的数据，该数据与查询中的$des匹配（并且以JSON格式）。我试图运行这个，但它只显示了这个结果：

{"busDetails":[]}

但我希望它能像这样回归：

{
"busDetails": [{
    "id": "8",
    "route": "Caticlan, Aklan",
    "busName": "Ceres Liner",
    "busType": "regular",
    "assignedTerminal": "Molo Terminal",
    "timeFirstTrip": "03:30:00",
    "timeLastTrip": "20:15:00",
    "timeInterval": "20",
    "estFare": "0",
    "estDistance": "270",
    "estTravelTime": "4hrs 27min",
    "DualRoute": "San Jose, Pandan, Libetad"
}, {
    "id": "17",
    "route": "Caticlan, Aklan",
    "busName": "Ceres Liner",
    "busType": "regular",
    "assignedTerminal": "Ceres Terminal",
    "timeFirstTrip": "02:30:00",
    "timeLastTrip": "17:00:00",
    "timeInterval": "30",
    "estFare": "0",
    "estDistance": "226",
    "estTravelTime": "4hr 33min",
    "DualRoute": "Kalibo, Passi City"
}, {
    "id": "18",
    "route": "Caticlan, Aklan",
    "busName": "Ceres Liner",
    "busType": "aircon",
    "assignedTerminal": "Ceres Terminal",
    "timeFirstTrip": "03:00:00",
    "timeLastTrip": "17:00:00",
    "timeInterval": "30",
    "estFare": "370",
    "estDistance": "226",
    "estTravelTime": "4hr 33min",
    "DualRoute": "Kalibo, Passi City"
}]
}

没有显示错误。而且我也没有看到语法中的任何错误。