Php 转换为PDO后，ListView中不显示数据

我已经创建了一个包含ListView的应用程序。我使用PHP连接android和数据库。现在，我使用MySQLi，它可以正常工作。但当我转换为PDO时，数据不会显示。我使用'Log.d'来跟踪数据得到了什么。结果如下：

MySQLi（无错误）-{“数据”：[{“报告id”：19，“任务名称”：“ngantuk”，“badgeid”：“12345”，“报告日期”：“2019年12月4日”，等等

PDO（非日志显示数据）

下面是MySQLi和PDO的当前代码

MySQLi

<?php 

    require_once 'config.php';

    if (mysqli_connect_errno()) {
        echo "Failed to connect to MySQL: " . mysqli_connect_error();
        die();
    }

    $badgeid = $_GET["badgeid"] ?? "";

    $stmt = $conn->prepare("SELECT report_id, task_name, badgeid, report_date, photo_before, photo_after, report_status FROM report WHERE badgeid = '$badgeid' AND report_status = 'Pending';");
    $stmt->execute();
    $stmt->bind_result($report_id, $task_name, $badgeid, $report_date, $photo_before, $photo_after, $report_status);

    $task = array(); 

    while($stmt->fetch()){
        $temp = array();
        $temp['report_id'] = $report_id; 
        $temp['task_name'] = $task_name; 
        $temp['badgeid'] = $badgeid;

        $booked = strtotime($report_date);
        $report_date = date("d M Y", $booked);

        $temp['report_date'] = $report_date;
        $temp['photo_before'] = $photo_before;
        $temp['photo_after'] = $photo_after;
        $temp['report_status'] = $report_status; 
        array_push($task, $temp);
    }

    $response = array();
    $response["data"] = $task;
    echo json_encode($response);

?>

---

有人知道我的PDO代码有什么问题吗？

mysqli代码和PDO代码不一样。我将代码从mysqli版本复制到PDO版本

PDOStatement:：fetch（）

一次获取一行。当您获取fetch的结果并将其放入while循环的条件中时，您正在创建一个无限循环，最终将耗尽内存

require_once 'configPDO.php';

$badgeid = $_GET["badgeid"] ?? "";
$stmt = $conn->prepare("SELECT report_id, task_name, badgeid, report_date, photo_before, photo_after, report_status FROM report WHERE badgeid = :badgeid AND report_status = 'Pending'");   
$stmt->bindParam(':badgeid',$badgeid,PDO::PARAM_STR);
$stmt->execute();
$task = [];

while ($result = $stmt->fetch(PDO::FETCH_ASSOC)) {
    $temp = [];
    $temp['report_id'] = $result['report_id']; 
    $temp['task_name'] = $result['task_name']; 
    $temp['badgeid'] = $result['badgeid'];

    $booked = strtotime($result['report_date']);
    $report_date = date("d M Y", $booked);

    $temp['report_date'] = $result['report_date'];
    $temp['photo_before'] = $result['photo_before'];
    $temp['photo_after'] = $result['photo_after'];
    $temp['report_status'] = $result['report_status']; 
    $task[] = $temp;
}   


$response = [];
$response["data"] = $task;

echo json_encode($response);

require_once 'configPDO.php';

$badgeid = $_GET["badgeid"] ?? "";
$stmt = $conn->prepare("SELECT report_id, task_name, badgeid, report_date, photo_before, photo_after, report_status FROM report WHERE badgeid = :badgeid AND report_status = 'Pending'");   
$stmt->bindParam(':badgeid',$badgeid,PDO::PARAM_STR);
$stmt->execute();
$task = [];

while ($result = $stmt->fetch(PDO::FETCH_ASSOC)) {
    $temp = [];
    $temp['report_id'] = $result['report_id']; 
    $temp['task_name'] = $result['task_name']; 
    $temp['badgeid'] = $result['badgeid'];

    $booked = strtotime($result['report_date']);
    $report_date = date("d M Y", $booked);

    $temp['report_date'] = $result['report_date'];
    $temp['photo_before'] = $result['photo_before'];
    $temp['photo_after'] = $result['photo_after'];
    $temp['report_status'] = $result['report_status']; 
    $task[] = $temp;
}   


$response = [];
$response["data"] = $task;

echo json_encode($response);