php数组转换json有问题大家过来看看

如图：


为什么下面这句话没有输出任何东西？

echo json_encode($result);#

输出结果
个人觉得可能是因为$data里面的数组元素为Client对象，在转为json的时候出问题了。但是我不知道是什么问题，怎么转换？或者有没有其他的转换方法？

class Result {		var $state;		var $data = array();	}

完整代码：

$start = 0;	$end = 2;	$uid = 1;	$result = new Result();	$result_set = getClients($start, $end, $uid);	$data = array();	$count = 0;		while($row = mysql_fetch_array($result_set)) {		$client = new Client();		$client->cid = $row['id'];		$client->gender = $row['gender'];		$client->rank = $row['rank'];		$client->name = $row['name'];		$client->phoneNum = $row['phoneNum'];		$client->email = $row['email'];		$client->address = $row['address'];		$result->data[$count] = $client;		echo $result->data[$count]->cid."  ";		echo $result->data[$count]->gender."  ";		echo $result->data[$count]->rank."  ";		echo $result->data[$count]->name."  ";		echo $result->data[$count]->phoneNum."  ";		echo $result->data[$count]->address."\n";		$count++;    }	if(count($data) > 0) {		$result->state = 0;	} else {		$result->state = 1;	}		echo json_encode($result);#

输出结果 class Result { var $state; var $data = array(); }
输出结果：

---------- debug php ----------Deprecated: mysql_connect(): The mysql extension is deprecated and will be removed in the future: use mysqli or PDO instead in D:\WWW\wsd\trunk\src\server\api\db\init_db.php on line 10Deprecated: mysql_connect(): The mysql extension is deprecated and will be removed in the future: use mysqli or PDO instead in D:\WWW\wsd\trunk\src\server\api\db\init_db.php on line 103  0  经理  张小莉  18825044888  广东省广州市天河区4  0  主管  吴美凤  18576430777  广东省深圳市南山区蛇口南海大道1079号PHP Deprecated:  mysql_connect(): The mysql extension is deprecated and will be removed in the future: use mysqli or PDO instead in D:\WWW\wsd\trunk\src\server\api\db\init_db.php on line 10PHP Deprecated:  mysql_connect(): The mysql extension is deprecated and will be removed in the future: use mysqli or PDO instead in D:\WWW\wsd\trunk\src\server\api\db\init_db.php on line 10Output completed (0 sec consumed) - Normal Termination

应该有输出类似这种格式才对的：

{"state":1,"data":[           {"cid":3,          "gender":0,          "rank":"经理"          "name":" 张小莉"          "phoneNum":"18825044888  "          "address":"广东省广州市天河区"},          {"cid":4,          "gender":0,          "rank":"主管"          "name":" 吴美凤"          "phoneNum":"18576430777  "          "address":" 广东省深圳市南山区蛇口南海大道1079号"}          ]}

请问这是什么问题呢？怎么解决？谢谢！

回复讨论(解决方案)

print_r($result);
能看到什么？

$result是一个对象来的，输出有错：
Catchable fatal error: Object of class Result could not be converted to string in D:\WWW\wsd\trunk\src\server\api\getClients.php on line 44

Object of class Result could not be converted to string 对象不能被转换为字符串
既如此，当然也不能 json 了
看看你的 Client 类定义

可能没有值吧

编码问题，json_encode()只对utf-8有效，创建数据库表的时候设置好表的编码为utf-8，连接数据库的时候也设置一下编码就行了，类似：
function connect_host() {
$host = "127.0.0.1";
$name_db = "root";
$password_db ="root";
$name_tb = "wsd_db";
$con = mysql_connect($host, $name_db, $password_db);

if(!$con) {
echo "connect host failed". mysql_error();
return;
}
mysql_select_db($name_tb, $con);
mysql_query("SET NAMES UTF8");#设置utf-8编码
return $con;
}