将数据从Swift发送到PHP，但不返回任何内容

我正在尝试将数据从SWIFT发送到PHP

Swift似乎正在使用POST发送正确的数据

let url:NSURL = NSURL(string: url)!
let session = URLSession.shared
let request = NSMutableURLRequest(url: url as URL)
    request.httpMethod = "POST"

let paramString = "table_id='1'"
    request.httpBody = paramString.data(using: String.Encoding.utf8)

然而，当PHP接收到它时，它什么也不返回

$contents = $_REQUEST['table_id']; 
$abc = $contents;

$sql = "SELECT * FROM menu_main_items WHERE table_id='".$abc."'";

if ($result = mysqli_query($con, $sql)) {
    $resultArray = array();
    $tempArray = array();
    while($row = $result->fetch_object()){
        $tempArray = $row;
        array_push($resultArray, $tempArray);
}
echo json_encode($resultArray);

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您认为问题似乎是什么？

非常确定您需要这样做，因为它是unicode\u utf\u 8

$contents = htmlentities($_REQUEST['table_id']);

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NSURLConnection.sendAsynchronousRequest

。。。