return 语句不返回任何内容答案

【问题标题】：return statement doesn't return anythingreturn 语句不返回任何内容
【发布时间】：2017-08-17 19:49:00
【问题描述】：

所以基本上，我有一个函数 getPayments()。这个函数应该执行一个查询，从多个表中选择（连接）。这是我的代码

function getPayments($userid, $schoolyear) {
    $stmt = $this->con->prepare("SELECT tbl_payment.payment_receipt_type AS RType, tbl_payment.payment_receipt_number AS RNumber, tbl_feetype.feetype_name AS FName, tbl_payment.payment_amount AS PAmount, tbl_month.month_date AS MDate, tbl_payment.payment_dateadded AS PAdded 
FROM tbl_payment
  INNER JOIN tbl_student ON tbl_student.student_id = tbl_payment.student_id 
  INNER JOIN tbl_schoolyear ON tbl_schoolyear.schoolyear_id = tbl_payment.schoolyear_id
  INNER JOIN tbl_feetype ON tbl_feetype.feetype_id = tbl_payment.feetype_id 
  INNER JOIN tbl_month ON tbl_month.month_id = tbl_payment.month_id   
  WHERE tbl_payment.schoolyear_id = ? AND tbl_payment.student_id = ? ORDER BY payment_dateadded DESC");

    $stmt->bind_param("ss", $userid, $schoolyear);
    $stmt->execute();
    $stmt->bind_result($RType, $RNumber, $FName, $PAmount, $MDate, $PAdded);

    $payments = array();

    while ($stmt->fetch()) {
        $temp = array();

        $temp['paymenttype'] = $RType;
        $temp['receiptnumber'] = $RNumber;
        $temp['feename'] = $FName;
        $temp['paymentamount'] = $PAmount;
        $temp['monthname'] = $MDate;
        $temp['paymentdate'] = $PAdded;

        array_push($payments, $temp);
    }

    return $payments;
}

在我的 index.php 文件中：

//getting payment details for a user
$app->get('/payment/{id}/{sy}', function (Request $request, Response $response) {
$route = $request->getAttribute('route');
// $userid = $request->getAttribute('id');
$userid = $route->getArgument('id');
$schoolyear = $route->getArgument('sy');
    // $schoolyear = $request->getAttribute('sy');
    $db = new DbOperation();
    $payments = $db->getPayments($userid, $schoolyear);
    $response->getBody()->write(json_encode(array("payments" => $payments)));
});

^ 这行代码将从 getPayment() 函数中获取返回的数组结果，然后将其编码为 json。

问题是，在 Postman 中测试了我的 API 后，Postman 只给了我这个结果

{"payments":[]}

请帮助我。谢谢你。（对不起我的英语不好）

【问题讨论】：

你能确保你的 MySQL 查询正在返回结果吗？
@Ice76 是的，在 phpmyadmin 中尝试了这个查询，它正在返回结果。

标签： php rest api mysqli

【解决方案1】：

找到答案。我放错了一些变量。

$stmt->bind_param("ss", $userid, $schoolyear); 行应该写成$stmt->bind_param("ss", $schoolyear, $userid);。

现在一切正常。谢谢你。 :)

此主题现已关闭。

【讨论】：