从PHP和mySQL返回整数到Android

我有一个mySQL数据库在线。我可以更新分数，效果很好。现在我想返回一个行号到Android，但我做不到。我的php文件：

 <?php

$name = $_REQUEST['jugador'];
$score = $_REQUEST['score'];
$moles = $_REQUEST['topos']; 

$con = mysql_connect("hots","db","pass");
if (!$con)
  {
  die('Could not connect: ' . mysql_error());
  }

mysql_select_db("a5385197_scores", $con);

mysql_query("INSERT INTO scores VALUES (null, '$name', $score, $moles)");

$result = mysql_query("SELECT COUNT(1) FROM scores WHERE score >= $score");

echo json_encode($result);

mysql_close($con);
 ?>

结果我得到一个错误：

10-30 01:13:29.445: I/miTraza(29304): Recive: <br><table border='1' cellpadding='2' bgcolor='#FFFFDF' bordercolor='#E8B900' align='center'><tr><td><font face='Arial' size='1' color='#000000'><b>PHP Error Message</b></font></td></tr></table><br />
10-30 01:13:29.445: I/miTraza(29304): <b>Warning</b>:  [json] (php_json_encode) type is unsupported, encoded as null in <b>/home/a5385197/public_html/try.php</b> on line <b>21</b><br />
10-30 01:13:29.445: I/miTraza(29304): <br><table border='1' cellpadding='2' bgcolor='#FFFFDF' bordercolor='#E8B900' align='center'><tr><td><div align='center'><a href='http://www.000webhost.com/'><font face='Arial' size='1' color='#000000'>Free Web Hosting</font></a></div></td></tr></table>null
10-30 01:13:29.445: I/miTraza(29304): <!-- Hosting24 Analytics Code -->
10-30 01:13:29.445: I/miTraza(29304): <script type="text/javascript" src="http://stats.hosting24.com/count.php"></script>
10-30 01:13:29.445: I/miTraza(29304): <!-- End Of Analytics Code -->

10-30 01:13:29.445:I/miTraza（29304）：接收：
PHP错误消息

10-30 01:13:29.445:I/miTraza（29304）：警告：[json]（php_json_encode）类型不受支持，在第21行的/home/a5385197/public_html/try.php中编码为null

10-30 01:13:29.445:I/miTraza（29304）：
null
10-30 01:13:29.445:I/miTraza（29304）：
10-30 01:13:29.445:I/miTraza（29304）：
10-30 01:13:29.445:I/miTraza（29304）：

我从PHP开始，所以很容易出错

感谢您的帮助。

echo json_encode（mysql_fetch_数组（$result））

10-30 01:13:29.445: I/miTraza(29304): Recive: <br><table border='1' cellpadding='2' bgcolor='#FFFFDF' bordercolor='#E8B900' align='center'><tr><td><font face='Arial' size='1' color='#000000'><b>PHP Error Message</b></font></td></tr></table><br />
10-30 01:13:29.445: I/miTraza(29304): <b>Warning</b>:  [json] (php_json_encode) type is unsupported, encoded as null in <b>/home/a5385197/public_html/try.php</b> on line <b>21</b><br />
10-30 01:13:29.445: I/miTraza(29304): <br><table border='1' cellpadding='2' bgcolor='#FFFFDF' bordercolor='#E8B900' align='center'><tr><td><div align='center'><a href='http://www.000webhost.com/'><font face='Arial' size='1' color='#000000'>Free Web Hosting</font></a></div></td></tr></table>null
10-30 01:13:29.445: I/miTraza(29304): <!-- Hosting24 Analytics Code -->
10-30 01:13:29.445: I/miTraza(29304): <script type="text/javascript" src="http://stats.hosting24.com/count.php"></script>
10-30 01:13:29.445: I/miTraza(29304): <!-- End Of Analytics Code -->