生成JSON后，我得到了一个空白屏幕

我有一个db与"id，用户id，时间戳，消息，地址，纬度，经度"，我有一个文件"get_thoughts.php"，显示我在一个表的db表的内容。但我有另一个文件"get_thinkts_json .php"，只生成一个json发送到android应用程序。问题是，生成器是空的，当我调用它，没有什么里面，正如我所说的，与第一个文件，我得到所有的数据。

有什么问题吗?

 <style type="text/css">
.datagrid table { border-collapse: collapse; text-align: left; width: 100%; } .datagrid {font: normal 12px/150% Arial, Helvetica, sans-serif; background: #fff; overflow: hidden; -webkit-border-radius: 5px; -moz-border-radius: 5px; border-radius: 5px; }.datagrid table td, .datagrid table th { padding: 5px 10px; }.datagrid table thead th {background:-webkit-gradient( linear, left top, left bottom, color-stop(0.05, #006699), color-stop(1, #00557F) );background:-moz-linear-gradient( center top, #006699 5%, #00557F 100% );filter:progid:DXImageTransform.Microsoft.gradient(startColorstr='#006699', endColorstr='#00557F');background-color:#006699; color:#FFFFFF; font-size: 12px; font-weight: bold; } .datagrid table thead th:first-child { border: none; }.datagrid table tbody td { color: #00557F; font-size: 12px;font-weight: normal; }.datagrid table tbody .alt td { background: #E1EEf4; color: #00557F; }.datagrid table tbody td:first-child { border-left: none; }.datagrid table tbody tr:last-child td { border-bottom: none; }.datagrid table tfoot td div { border-top: 1px solid #006699;background: #E1EEf4;} .datagrid table tfoot td { padding: 0; font-size: 12px } .datagrid table tfoot td div{ padding: 3px; }.datagrid table tfoot td ul { margin: 0; padding:0; list-style: none; text-align: right; }.datagrid table tfoot  li { display: inline; }.datagrid table tfoot li a { text-decoration: none; display: inline-block;  padding: 2px 8px; margin: 1px;color: #FFFFFF;border: 1px solid #006699;-webkit-border-radius: 5px; -moz-border-radius: 5px; border-radius: 5px; background:-webkit-gradient( linear, left top, left bottom, color-stop(0.05, #006699), color-stop(1, #00557F) );background:-moz-linear-gradient( center top, #006699 5%, #00557F 100% );filter:progid:DXImageTransform.Microsoft.gradient(startColorstr='#006699', endColorstr='#00557F');background-color:#006699; }.datagrid table tfoot ul.active, .datagrid table tfoot ul a:hover { text-decoration: none;border-color: #00557F; color: #FFFFFF; background: none; background-color:#006699;}div.dhtmlx_window_active, div.dhx_modal_cover_dv { position: fixed !important; }
</style>
<?php
/*
 * Following code will list all the products
 */
// array for JSON response
$response = array();
// include db connect class
require_once __DIR__ . '/db_connect.php';
// connecting to db
$db = new DB_CONNECT();
// get all products from products table
$result = mysql_query("SELECT * FROM thoughts") or die(mysql_error());
// check for empty result
if (mysql_num_rows($result) > 0) {
    // looping through all results
    // products node
    $response["thoughts"] = array();
    echo '<center><div class="datagrid"><table>';
    echo '<thead><tr><th>ID</th><th>USERID</th><th>TIMESTAMP</th><th>MESSAGE</th><th>ADDRESS</th><th>LATITUDE</th><th>LONGITUDE</th></tr></thead><tbody>';
    while ($row = mysql_fetch_array($result)) {
        // temp user array
        $thought = array();
        $thought["id"] = $row["id"];
        $thought["userid"] = $row["userid"];
        $thought["timestamp"] = $row["timestamp"];
        $thought["message"] = $row["message"];
        $thought["address"] = $row["address"];
        $thought["latitude"] = $row['latitude'];
        $thought["longitude"] = $row['longitude'];

        echo '<tr><td>'.$row['id'].'</td><td>'.$row['userid'].'</td><td>'.$row['timestamp'].'</td><td>'.$row['message'].'</td><td>'.$row['address'].'</td><td>'.$row['latitude'].'</td><td>'.$row['longitude'].'</td></tr>';
        //echo '<tr><td class="tg-center">'.$row['id'].'</td><td class="tg-center">'.$row['username'].'</td><tdclass="tg-center">'.$row['timestamp'].'</td><td class="tg-center">'.$row['classroom'].'</td></tr>';
        // push single product into final response array
        array_push($response["thoughts"], $thought);
    }
    // success
    $response["success"] = 1;
    // echoing JSON response
    echo json_encode($response);
    echo '</table></center>';
} else {
    // no products found
    $response["success"] = 0;
    $response["message"] = "No events found";
    // echo no users JSON
    echo json_encode($response);
}
?>

文件get_thoughts_json.php

<?php
/*
 * Following code will list all the products
 */
// array for JSON response
$response = array();
// include db connect class
require_once __DIR__ . '/db_connect.php';
// connecting to db
$db = new DB_CONNECT();
// get all products from products table
$result = mysql_query("SELECT * FROM thoughts") or die(mysql_error());
// check for empty result
if (mysql_num_rows($result) > 0) {
    while($row = mysql_fetch_assoc($result)) {
      $response[] = array('thought'=>$row);
    }
    header('Content-type: application/json');
    echo json_encode(array('thoughts'=>$response));
    $response["success"] = 1;
    // echoing JSON response
    echo json_encode($response);
} else {
    // no products found
    $response["success"] = 0;
    $response["message"] = "No events found";
    // echo no users JSON
    echo json_encode($response);
}
?>

谢谢你的建议。

一些错误:

<br />
<b>Deprecated</b>:  mysql_connect(): The mysql extension is deprecated and will be removed in the future: use mysqli or PDO instead in <b>C:'xampp'htdocs'iw'thoughts'db_connect.php</b> on line <b>30</b><br />

header('Content-type: application/json');
echo json_encode(array('thoughts'=>$response));
$response["success"] = 1;
// echoing JSON response
echo json_encode($response);

header('Content-type: application/json');
$response['thoughts'] = $response;
$response["success"] = 1;
// echoing JSON response
echo json_encode($response);

header("Content-type: application/json");